31681037 has 4 divisors (see below), whose sum is σ = 33348480. Its totient is φ = 30013596.

The previous prime is 31681007. The next prime is 31681043. The reversal of 31681037 is 73018613.

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 31681037 - 2¹⁴ = 31664653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31681007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833693 + ... + 833730.

It is an arithmetic number, because the mean of its divisors is an integer number (8337120).

Almost surely, 2^31681037 is an apocalyptic number.

It is an amenable number.

31681037 is a deficient number, since it is larger than the sum of its proper divisors (1667443).

31681037 is a wasteful number, since it uses less digits than its factorization.

31681037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667442.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 31681037 is about 5628.5910315105. The cubic root of 31681037 is about 316.4218482038.

The spelling of 31681037 in words is "thirty-one million, six hundred eighty-one thousand, thirty-seven".