31137266137 has 4 divisors (see below), whose sum is σ = 31138222500. Its totient is φ = 31136309776.

The previous prime is 31137266057. The next prime is 31137266143. The reversal of 31137266137 is 73166273113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73166273113 = 20389 ⋅3588517.

It can be written as a sum of positive squares in 2 ways, for example, as 17102362176 + 14034903961 = 130776^2 + 118469^2 .

It is a cyclic number.

It is not a de Polignac number, because 31137266137 - 2⁷ = 31137266009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31137266137.

It is not an unprimeable number, because it can be changed into a prime (31137266837) 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, 427558 + ... + 495055.

It is an arithmetic number, because the mean of its divisors is an integer number (7784555625).

Almost surely, 2^31137266137 is an apocalyptic number.

It is an amenable number.

31137266137 is a deficient number, since it is larger than the sum of its proper divisors (956363).

31137266137 is an equidigital number, since it uses as much as digits as its factorization.

31137266137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956362.

The product of its digits is 95256, while the sum is 40.

The spelling of 31137266137 in words is "thirty-one billion, one hundred thirty-seven million, two hundred sixty-six thousand, one hundred thirty-seven".