31481755261 has 16 divisors (see below), whose sum is σ = 34419280896. Its totient is φ = 28556910000.

The previous prime is 31481755259. The next prime is 31481755267. The reversal of 31481755261 is 16255718413.

It is a cyclic number.

It is not a de Polignac number, because 31481755261 - 2¹ = 31481755259 is a prime.

It is a super-2 number, since 2×31481755261² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31481755267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14772166 + ... + 14774296.

It is an arithmetic number, because the mean of its divisors is an integer number (2151205056).

Almost surely, 2^31481755261 is an apocalyptic number.

It is an amenable number.

31481755261 is a deficient number, since it is larger than the sum of its proper divisors (2937525635).

31481755261 is a wasteful number, since it uses less digits than its factorization.

31481755261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464.

The product of its digits is 201600, while the sum is 43.

The spelling of 31481755261 in words is "thirty-one billion, four hundred eighty-one million, seven hundred fifty-five thousand, two hundred sixty-one".