31116961 has 4 divisors (see below), whose sum is σ = 31779072. Its totient is φ = 30454852.

The previous prime is 31116959. The next prime is 31116997. The reversal of 31116961 is 16961113.

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.

It is a cyclic number.

It is not a de Polignac number, because 31116961 - 2¹ = 31116959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31116361) 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, 330985 + ... + 331078.

It is an arithmetic number, because the mean of its divisors is an integer number (7944768).

Almost surely, 2^31116961 is an apocalyptic number.

It is an amenable number.

31116961 is a deficient number, since it is larger than the sum of its proper divisors (662111).

31116961 is an equidigital number, since it uses as much as digits as its factorization.

31116961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662110.

The product of its digits is 972, while the sum is 28.

The square root of 31116961 is about 5578.2578821707. The cubic root of 31116961 is about 314.5326436325.

The spelling of 31116961 in words is "thirty-one million, one hundred sixteen thousand, nine hundred sixty-one".