31343639497 has 4 divisors (see below), whose sum is σ = 31590439936. Its totient is φ = 31096839060.

The previous prime is 31343639443. The next prime is 31343639527. The reversal of 31343639497 is 79493634313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79493634313 = 61 ⋅1303174333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31343639497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31343639417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123400029 + ... + 123400282.

It is an arithmetic number, because the mean of its divisors is an integer number (7897609984).

Almost surely, 2^31343639497 is an apocalyptic number.

It is an amenable number.

31343639497 is a deficient number, since it is larger than the sum of its proper divisors (246800439).

31343639497 is a wasteful number, since it uses less digits than its factorization.

31343639497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246800438.

The product of its digits is 4408992, while the sum is 52.

The spelling of 31343639497 in words is "thirty-one billion, three hundred forty-three million, six hundred thirty-nine thousand, four hundred ninety-seven".