31941987 has 32 divisors (see below), whose sum is σ = 54120960. Its totient is φ = 16273920.

The previous prime is 31941971. The next prime is 31942007. The reversal of 31941987 is 78914913.

It is a happy number.

It is not a de Polignac number, because 31941987 - 2⁴ = 31941971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31941937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10939 + ... + 13547.

It is an arithmetic number, because the mean of its divisors is an integer number (1691280).

Almost surely, 2^31941987 is an apocalyptic number.

31941987 is a deficient number, since it is larger than the sum of its proper divisors (22178973).

31941987 is a wasteful number, since it uses less digits than its factorization.

31941987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

The product of its digits is 54432, while the sum is 42.

The square root of 31941987 is about 5651.7242501736. The cubic root of 31941987 is about 317.2882403864.

The spelling of 31941987 in words is "thirty-one million, nine hundred forty-one thousand, nine hundred eighty-seven".