31800275149 has 4 divisors (see below), whose sum is σ = 31800665664. Its totient is φ = 31799884636.

The previous prime is 31800275093. The next prime is 31800275161. The reversal of 31800275149 is 94157200813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31800275149 - 2¹¹ = 31800273101 is a prime.

It is a super-2 number, since 2×31800275149² (a number of 22 digits) 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 (31800275449) 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, 21667 + ... + 253120.

It is an arithmetic number, because the mean of its divisors is an integer number (7950166416).

Almost surely, 2^31800275149 is an apocalyptic number.

It is an amenable number.

31800275149 is a deficient number, since it is larger than the sum of its proper divisors (390515).

31800275149 is a wasteful number, since it uses less digits than its factorization.

31800275149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390514.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 31800275149 in words is "thirty-one billion, eight hundred million, two hundred seventy-five thousand, one hundred forty-nine".