31079021 has 2 divisors, whose sum is σ = 31079022. Its totient is φ = 31079020.

The previous prime is 31079011. The next prime is 31079023. The reversal of 31079021 is 12097013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18369796 + 12709225 = 4286^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 31079021 - 2¹⁰ = 31077997 is a prime.

Together with 31079023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31079023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15539510 + 15539511.

It is an arithmetic number, because the mean of its divisors is an integer number (15539511).

Almost surely, 2^31079021 is an apocalyptic number.

It is an amenable number.

31079021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31079021 is an equidigital number, since it uses as much as digits as its factorization.

31079021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 31079021 is about 5574.8561416417. The cubic root of 31079021 is about 314.4047581599.

The spelling of 31079021 in words is "thirty-one million, seventy-nine thousand, twenty-one".