681742179 has 12 divisors (see below), whose sum is σ = 1018695600. Its totient is φ = 438822384.

The previous prime is 681742169. The next prime is 681742183. The reversal of 681742179 is 971247186.

It is a happy number.

It is not a de Polignac number, because 681742179 - 2⁷ = 681742051 is a prime.

It is a super-3 number, since 3×681742179³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (681742169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1305759 + ... + 1306280.

It is an arithmetic number, because the mean of its divisors is an integer number (84891300).

Almost surely, 2^681742179 is an apocalyptic number.

681742179 is a deficient number, since it is larger than the sum of its proper divisors (336953421).

681742179 is a wasteful number, since it uses less digits than its factorization.

681742179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612074 (or 2612071 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 681742179 is about 26110.1930096275. The cubic root of 681742179 is about 880.1162806915.

The spelling of 681742179 in words is "six hundred eighty-one million, seven hundred forty-two thousand, one hundred seventy-nine".