31255213442 has 4 divisors (see below), whose sum is σ = 46882820166. Its totient is φ = 15627606720.

The previous prime is 31255213433. The next prime is 31255213469. The reversal of 31255213442 is 24431255213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24431255213 = 36013 ⋅678401.

It can be written as a sum of positive squares in only one way, i.e., 26121347641 + 5133865801 = 161621^2 + 71651^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31255213399 and 31255213408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7813803359 + ... + 7813803362.

Almost surely, 2^31255213442 is an apocalyptic number.

31255213442 is a deficient number, since it is larger than the sum of its proper divisors (15627606724).

31255213442 is a wasteful number, since it uses less digits than its factorization.

31255213442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15627606723.

The product of its digits is 28800, while the sum is 32.

Adding to 31255213442 its reverse (24431255213), we get a palindrome (55686468655).

The spelling of 31255213442 in words is "thirty-one billion, two hundred fifty-five million, two hundred thirteen thousand, four hundred forty-two".