155631450 has 48 divisors (see below), whose sum is σ = 415660896. Its totient is φ = 38308800.

The previous prime is 155631433. The next prime is 155631457. The reversal of 155631450 is 54136551.

It is a super-2 number, since 2×155631450² = 48442296458205000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155631457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37956 + ... + 41855.

It is an arithmetic number, because the mean of its divisors is an integer number (8659602).

Almost surely, 2^155631450 is an apocalyptic number.

155631450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155631450 is an abundant number, since it is smaller than the sum of its proper divisors (260029446).

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

155631450 is a wasteful number, since it uses less digits than its factorization.

155631450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79839 (or 79834 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 155631450 is about 12475.2334647493. The cubic root of 155631450 is about 537.8969989334.

The spelling of 155631450 in words is "one hundred fifty-five million, six hundred thirty-one thousand, four hundred fifty".