31340323402 has 4 divisors (see below), whose sum is σ = 47010485106. Its totient is φ = 15670161700.

The previous prime is 31340323381. The next prime is 31340323451. The reversal of 31340323402 is 20432304313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20432304313 = 47 ⋅434729879.

It can be written as a sum of positive squares in only one way, i.e., 23522050161 + 7818273241 = 153369^2 + 88421^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7835080849 + ... + 7835080852.

Almost surely, 2^31340323402 is an apocalyptic number.

31340323402 is a deficient number, since it is larger than the sum of its proper divisors (15670161704).

31340323402 is a wasteful number, since it uses less digits than its factorization.

31340323402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15670161703.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 31340323402 its reverse (20432304313), we get a palindrome (51772627715).

The spelling of 31340323402 in words is "thirty-one billion, three hundred forty million, three hundred twenty-three thousand, four hundred two".