681157801 has 3 divisors (see below), whose sum is σ = 681183901. Its totient is φ = 681131702.

The previous prime is 681157787. The next prime is 681157861. The reversal of 681157801 is 108751186.

The square root of 681157801 is 26099.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 681157801 - 2¹⁵ = 681125033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681157861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13050 + ... + 39148.

Almost surely, 2^681157801 is an apocalyptic number.

681157801 is the 26099-th square number.

681157801 is the 13050-th centered octagonal number.

It is an amenable number.

681157801 is a deficient number, since it is larger than the sum of its proper divisors (26100).

681157801 is an frugal number, since it uses more digits than its factorization.

681157801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52198 (or 26099 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 37.

The cubic root of 681157801 is about 879.8647351496.

The spelling of 681157801 in words is "six hundred eighty-one million, one hundred fifty-seven thousand, eight hundred one".