31197961 has 4 divisors (see below), whose sum is σ = 31726800. Its totient is φ = 30669124.

The previous prime is 31197953. The next prime is 31197967. The reversal of 31197961 is 16979113.

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: 16979113 = 479 ⋅35447.

It is a cyclic number.

It is not a de Polignac number, because 31197961 - 2³ = 31197953 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 31197961.

It is not an unprimeable number, because it can be changed into a prime (31197967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264331 + ... + 264448.

It is an arithmetic number, because the mean of its divisors is an integer number (7931700).

Almost surely, 2^31197961 is an apocalyptic number.

It is an amenable number.

31197961 is a deficient number, since it is larger than the sum of its proper divisors (528839).

31197961 is an equidigital number, since it uses as much as digits as its factorization.

31197961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528838.

The product of its digits is 10206, while the sum is 37.

The square root of 31197961 is about 5585.5134947469. The cubic root of 31197961 is about 314.8053252491.

The spelling of 31197961 in words is "thirty-one million, one hundred ninety-seven thousand, nine hundred sixty-one".