155551131 has 32 divisors (see below), whose sum is σ = 238256640. Its totient is φ = 100245600.

The previous prime is 155551129. The next prime is 155551141. The reversal of 155551131 is 131155551.

It is not a de Polignac number, because 155551131 - 2¹ = 155551129 is a prime.

It is a super-2 number, since 2×155551131² = 48392308710758322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 155551095 and 155551104.

It is not an unprimeable number, because it can be changed into a prime (155551141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100836 + ... + 102366.

It is an arithmetic number, because the mean of its divisors is an integer number (7445520).

Almost surely, 2^155551131 is an apocalyptic number.

155551131 is a deficient number, since it is larger than the sum of its proper divisors (82705509).

155551131 is a wasteful number, since it uses less digits than its factorization.

155551131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664 (or 1658 counting only the distinct ones).

The product of its digits is 1875, while the sum is 27.

The square root of 155551131 is about 12472.0139111532. The cubic root of 155551131 is about 537.8044495517.

The spelling of 155551131 in words is "one hundred fifty-five million, five hundred fifty-one thousand, one hundred thirty-one".