2155506031 has 12 divisors (see below), whose sum is σ = 2517196608. Its totient is φ = 1840376832.

The previous prime is 2155506011. The next prime is 2155506037. The reversal of 2155506031 is 1306055512.

2155506031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2155506031 - 2⁷ = 2155505903 is a prime.

It is a super-2 number, since 2×2155506031² = 9292412499354745922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155506037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72991 + ... + 98176.

It is an arithmetic number, because the mean of its divisors is an integer number (209766384).

Almost surely, 2^2155506031 is an apocalyptic number.

2155506031 is a deficient number, since it is larger than the sum of its proper divisors (361690577).

2155506031 is a wasteful number, since it uses less digits than its factorization.

2155506031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171438 (or 171431 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 2155506031 is about 46427.4275725029. The cubic root of 2155506031 is about 1291.7637135510.

The spelling of 2155506031 in words is "two billion, one hundred fifty-five million, five hundred six thousand, thirty-one".