681136371 has 20 divisors (see below), whose sum is σ = 1050326464. Its totient is φ = 439441200.

The previous prime is 681136343. The next prime is 681136381. The reversal of 681136371 is 173631186.

681136371 is a `hidden beast` number, since 6 + 8 + 1 + 13 + 637 + 1 = 666.

It is not a de Polignac number, because 681136371 - 2¹⁰ = 681135347 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (681136381) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 133120 + ... + 138141.

Almost surely, 2^681136371 is an apocalyptic number.

681136371 is a deficient number, since it is larger than the sum of its proper divisors (369190093).

681136371 is a wasteful number, since it uses less digits than its factorization.

681136371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271304 (or 271295 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 681136371 is about 26098.5894446424. The cubic root of 681136371 is about 879.8555078707.

The spelling of 681136371 in words is "six hundred eighty-one million, one hundred thirty-six thousand, three hundred seventy-one".