155631887 has 4 divisors (see below), whose sum is σ = 155750496. Its totient is φ = 155513280.

The previous prime is 155631877. The next prime is 155631901. The reversal of 155631887 is 788136551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155631887 - 2⁴ = 155631871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155631877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57314 + ... + 59967.

It is an arithmetic number, because the mean of its divisors is an integer number (38937624).

Almost surely, 2^155631887 is an apocalyptic number.

155631887 is a deficient number, since it is larger than the sum of its proper divisors (118609).

155631887 is a wasteful number, since it uses less digits than its factorization.

155631887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118608.

The product of its digits is 201600, while the sum is 44.

The square root of 155631887 is about 12475.2509794393. The cubic root of 155631887 is about 537.8975023894.

The spelling of 155631887 in words is "one hundred fifty-five million, six hundred thirty-one thousand, eight hundred eighty-seven".