31285473137 has 2 divisors, whose sum is σ = 31285473138. Its totient is φ = 31285473136.

The previous prime is 31285473127. The next prime is 31285473181. The reversal of 31285473137 is 73137458213.

It is a happy number.

It is an a-pointer prime, because the next prime (31285473181) can be obtained adding 31285473137 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18912025441 + 12373447696 = 137521^2 + 111236^2 .

It is an emirp because it is prime and its reverse (73137458213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31285473137 - 2⁶ = 31285473073 is a prime.

It is not a weakly prime, because it can be changed into another prime (31285473127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15642736568 + 15642736569.

It is an arithmetic number, because the mean of its divisors is an integer number (15642736569).

Almost surely, 2^31285473137 is an apocalyptic number.

It is an amenable number.

31285473137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31285473137 is an equidigital number, since it uses as much as digits as its factorization.

31285473137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 44.

The spelling of 31285473137 in words is "thirty-one billion, two hundred eighty-five million, four hundred seventy-three thousand, one hundred thirty-seven".