681579037 has 2 divisors, whose sum is σ = 681579038. Its totient is φ = 681579036.

The previous prime is 681579029. The next prime is 681579061. The reversal of 681579037 is 730975186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460789156 + 220789881 = 21466^2 + 14859^2 .

It is a cyclic number.

It is not a de Polignac number, because 681579037 - 2³ = 681579029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681579137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340789518 + 340789519.

It is an arithmetic number, because the mean of its divisors is an integer number (340789519).

Almost surely, 2^681579037 is an apocalyptic number.

It is an amenable number.

681579037 is a deficient number, since it is larger than the sum of its proper divisors (1).

681579037 is an equidigital number, since it uses as much as digits as its factorization.

681579037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 681579037 is about 26107.0687171118. The cubic root of 681579037 is about 880.0460706769.

The spelling of 681579037 in words is "six hundred eighty-one million, five hundred seventy-nine thousand, thirty-seven".