31246861 has 4 divisors (see below), whose sum is σ = 31266972. Its totient is φ = 31226752.

The previous prime is 31246843. The next prime is 31246871. The reversal of 31246861 is 16864213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20884900 + 10361961 = 4570^2 + 3219^2 .

It is a cyclic number.

It is not a de Polignac number, because 31246861 - 2⁵ = 31246829 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 (31246871) 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, 7510 + ... + 10903.

It is an arithmetic number, because the mean of its divisors is an integer number (7816743).

Almost surely, 2^31246861 is an apocalyptic number.

It is an amenable number.

31246861 is a deficient number, since it is larger than the sum of its proper divisors (20111).

31246861 is a wasteful number, since it uses less digits than its factorization.

31246861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20110.

The product of its digits is 6912, while the sum is 31.

The square root of 31246861 is about 5589.8891760034. The cubic root of 31246861 is about 314.9697157414.

The spelling of 31246861 in words is "thirty-one million, two hundred forty-six thousand, eight hundred sixty-one".