31720949549 has 8 divisors (see below), whose sum is σ = 31795801728. Its totient is φ = 31646160000.

The previous prime is 31720949509. The next prime is 31720949573. The reversal of 31720949549 is 94594902713.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31720949549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31720949549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31720949509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1088924 + ... + 1117674.

It is an arithmetic number, because the mean of its divisors is an integer number (3974475216).

Almost surely, 2^31720949549 is an apocalyptic number.

It is an amenable number.

31720949549 is a deficient number, since it is larger than the sum of its proper divisors (74852179).

31720949549 is a wasteful number, since it uses less digits than its factorization.

31720949549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31315.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 31720949549 in words is "thirty-one billion, seven hundred twenty million, nine hundred forty-nine thousand, five hundred forty-nine".