681615131 has 2 divisors, whose sum is σ = 681615132. Its totient is φ = 681615130.

The previous prime is 681615107. The next prime is 681615163. The reversal of 681615131 is 131516186.

It is an a-pointer prime, because the next prime (681615163) can be obtained adding 681615131 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681615131 - 2¹⁰ = 681614107 is a prime.

It is a super-2 number, since 2×681615131² = 929198373616294322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (681605131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340807565 + 340807566.

It is an arithmetic number, because the mean of its divisors is an integer number (340807566).

Almost surely, 2^681615131 is an apocalyptic number.

681615131 is a deficient number, since it is larger than the sum of its proper divisors (1).

681615131 is an equidigital number, since it uses as much as digits as its factorization.

681615131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 681615131 is about 26107.7599766813. The cubic root of 681615131 is about 880.0616051052.

The spelling of 681615131 in words is "six hundred eighty-one million, six hundred fifteen thousand, one hundred thirty-one".