31243400522 has 4 divisors (see below), whose sum is σ = 46865100786. Its totient is φ = 15621700260.

The previous prime is 31243400509. The next prime is 31243400567. The reversal of 31243400522 is 22500434213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22500434213 = 167 ⋅134733139.

It can be written as a sum of positive squares in only one way, i.e., 28436414161 + 2806986361 = 168631^2 + 52981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31243400491 and 31243400500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7810850129 + ... + 7810850132.

Almost surely, 2^31243400522 is an apocalyptic number.

31243400522 is a deficient number, since it is larger than the sum of its proper divisors (15621700264).

31243400522 is a wasteful number, since it uses less digits than its factorization.

31243400522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15621700263.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 31243400522 its reverse (22500434213), we get a palindrome (53743834735).

The spelling of 31243400522 in words is "thirty-one billion, two hundred forty-three million, four hundred thousand, five hundred twenty-two".