681946955 has 32 divisors (see below), whose sum is σ = 875957760. Its totient is φ = 508204800.

The previous prime is 681946949. The next prime is 681946961. The reversal of 681946955 is 559649186.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (681946949) and next prime (681946961).

It is not a de Polignac number, because 681946955 - 2⁴ = 681946939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681946897 and 681946906.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1965092 + ... + 1965438.

It is an arithmetic number, because the mean of its divisors is an integer number (27373680).

Almost surely, 2^681946955 is an apocalyptic number.

681946955 is a deficient number, since it is larger than the sum of its proper divisors (194010805).

681946955 is a wasteful number, since it uses less digits than its factorization.

681946955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its digits is 2332800, while the sum is 53.

The square root of 681946955 is about 26114.1140956380. The cubic root of 681946955 is about 880.2043925198.

The spelling of 681946955 in words is "six hundred eighty-one million, nine hundred forty-six thousand, nine hundred fifty-five".