31790399434 has 4 divisors (see below), whose sum is σ = 47685599154. Its totient is φ = 15895199716.

The previous prime is 31790399413. The next prime is 31790399447. The reversal of 31790399434 is 43499309713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43499309713 = 29 ⋅1499976197.

It can be written as a sum of positive squares in only one way, i.e., 27783889225 + 4006510209 = 166685^2 + 63297^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7947599857 + ... + 7947599860.

Almost surely, 2^31790399434 is an apocalyptic number.

31790399434 is a deficient number, since it is larger than the sum of its proper divisors (15895199720).

31790399434 is a wasteful number, since it uses less digits than its factorization.

31790399434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15895199719.

The product of its (nonzero) digits is 2204496, while the sum is 52.

The spelling of 31790399434 in words is "thirty-one billion, seven hundred ninety million, three hundred ninety-nine thousand, four hundred thirty-four".