31961967 has 4 divisors (see below), whose sum is σ = 42615960. Its totient is φ = 21307976.

The previous prime is 31961959. The next prime is 31962013. The reversal of 31961967 is 76916913.

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 31961967 - 2³ = 31961959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31961957) 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, 5326992 + ... + 5326997.

It is an arithmetic number, because the mean of its divisors is an integer number (10653990).

Almost surely, 2^31961967 is an apocalyptic number.

31961967 is a deficient number, since it is larger than the sum of its proper divisors (10653993).

31961967 is a wasteful number, since it uses less digits than its factorization.

31961967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10653992.

The product of its digits is 61236, while the sum is 42.

The square root of 31961967 is about 5653.4915760086. The cubic root of 31961967 is about 317.3543821464.

The spelling of 31961967 in words is "thirty-one million, nine hundred sixty-one thousand, nine hundred sixty-seven".