681774931 has 4 divisors (see below), whose sum is σ = 681859192. Its totient is φ = 681690672.

The previous prime is 681774917. The next prime is 681774941. The reversal of 681774931 is 139477186.

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

It is a cyclic number.

It is not a de Polignac number, because 681774931 - 2⁹ = 681774419 is a prime.

It is a super-2 number, since 2×681774931² = 929634113080109522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681774941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28530 + ... + 46663.

It is an arithmetic number, because the mean of its divisors is an integer number (170464798).

Almost surely, 2^681774931 is an apocalyptic number.

681774931 is a deficient number, since it is larger than the sum of its proper divisors (84261).

681774931 is an equidigital number, since it uses as much as digits as its factorization.

681774931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84260.

The product of its digits is 254016, while the sum is 46.

The square root of 681774931 is about 26110.8201901051. The cubic root of 681774931 is about 880.1303745370.

The spelling of 681774931 in words is "six hundred eighty-one million, seven hundred seventy-four thousand, nine hundred thirty-one".