31720963 has 4 divisors (see below), whose sum is σ = 33586920. Its totient is φ = 29855008.

The previous prime is 31720957. The next prime is 31720981. The reversal of 31720963 is 36902713.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31720963 - 2¹³ = 31712771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31720943) 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, 932953 + ... + 932986.

It is an arithmetic number, because the mean of its divisors is an integer number (8396730).

Almost surely, 2^31720963 is an apocalyptic number.

31720963 is a deficient number, since it is larger than the sum of its proper divisors (1865957).

31720963 is a wasteful number, since it uses less digits than its factorization.

31720963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865956.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 31720963 is about 5632.1366283143. The cubic root of 31720963 is about 316.5547158593.

The spelling of 31720963 in words is "thirty-one million, seven hundred twenty thousand, nine hundred sixty-three".