155555131 has 4 divisors (see below), whose sum is σ = 155610000. Its totient is φ = 155500264.

The previous prime is 155555119. The next prime is 155555149. The reversal of 155555131 is 131555551.

155555131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131555551 = 1949 ⋅67499.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155555131 is a prime.

It is a super-2 number, since 2×155555131² = 48394797560854322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155555093 and 155555102.

It is not an unprimeable number, because it can be changed into a prime (155555111) 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, 22936 + ... + 28933.

It is an arithmetic number, because the mean of its divisors is an integer number (38902500).

Almost surely, 2^155555131 is an apocalyptic number.

155555131 is a deficient number, since it is larger than the sum of its proper divisors (54869).

155555131 is an equidigital number, since it uses as much as digits as its factorization.

155555131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54868.

The product of its digits is 9375, while the sum is 31.

The square root of 155555131 is about 12472.1742691481. The cubic root of 155555131 is about 537.8090593958.

The spelling of 155555131 in words is "one hundred fifty-five million, five hundred fifty-five thousand, one hundred thirty-one".