155631894 has 36 divisors (see below), whose sum is σ = 342873468. Its totient is φ = 47059320.

The previous prime is 155631877. The next prime is 155631901. The reversal of 155631894 is 498136551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 335907 + ... + 336369.

It is an arithmetic number, because the mean of its divisors is an integer number (9524263).

Almost surely, 2^155631894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155631894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171436734).

155631894 is an abundant number, since it is smaller than the sum of its proper divisors (187241574).

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

155631894 is an equidigital number, since it uses as much as digits as its factorization.

155631894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 479 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 155631894 is about 12475.2512599947. The cubic root of 155631894 is about 537.8975104539.

The spelling of 155631894 in words is "one hundred fifty-five million, six hundred thirty-one thousand, eight hundred ninety-four".