681198172 has 6 divisors (see below), whose sum is σ = 1192096808. Its totient is φ = 340599084.

The previous prime is 681198169. The next prime is 681198173. The reversal of 681198172 is 271891186.

It is a happy number.

It is a super-2 number, since 2×681198172² = 928061899072283168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681198173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85149768 + ... + 85149775.

Almost surely, 2^681198172 is an apocalyptic number.

It is an amenable number.

681198172 is a deficient number, since it is larger than the sum of its proper divisors (510898636).

681198172 is a wasteful number, since it uses less digits than its factorization.

681198172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170299547 (or 170299545 counting only the distinct ones).

The product of its digits is 48384, while the sum is 43.

The square root of 681198172 is about 26099.7734089781. The cubic root of 681198172 is about 879.8821174739.

The spelling of 681198172 in words is "six hundred eighty-one million, one hundred ninety-eight thousand, one hundred seventy-two".