155631000 has 128 divisors (see below), whose sum is σ = 555010560. Its totient is φ = 35568000.

The previous prime is 155630983. The next prime is 155631079. The reversal of 155631000 is 136551.

It is a happy number.

155631000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155631000² = 48442016322000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17295 + ... + 24705.

It is an arithmetic number, because the mean of its divisors is an integer number (4336020).

Almost surely, 2^155631000 is an apocalyptic number.

155631000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155631000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277505280).

155631000 is an abundant number, since it is smaller than the sum of its proper divisors (399379560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155631000 is a wasteful number, since it uses less digits than its factorization.

155631000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7442 (or 7428 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 155631000 is about 12475.2154290016. The cubic root of 155631000 is about 537.8964804994.

Adding to 155631000 its reverse (136551), we get a palindrome (155767551).

The spelling of 155631000 in words is "one hundred fifty-five million, six hundred thirty-one thousand".