31972019513 has 4 divisors (see below), whose sum is σ = 36539450880. Its totient is φ = 27404588148.

The previous prime is 31972019509. The next prime is 31972019533. The reversal of 31972019513 is 31591027913.

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: 31591027913 = 12101 ⋅2610613.

It is not a de Polignac number, because 31972019513 - 2² = 31972019509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31972019533) 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, 2283715673 + ... + 2283715686.

It is an arithmetic number, because the mean of its divisors is an integer number (9134862720).

Almost surely, 2^31972019513 is an apocalyptic number.

It is an amenable number.

31972019513 is a deficient number, since it is larger than the sum of its proper divisors (4567431367).

31972019513 is an equidigital number, since it uses as much as digits as its factorization.

31972019513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567431366.

The product of its (nonzero) digits is 51030, while the sum is 41.

The spelling of 31972019513 in words is "thirty-one billion, nine hundred seventy-two million, nineteen thousand, five hundred thirteen".