681200591 has 16 divisors (see below), whose sum is σ = 763893504. Its totient is φ = 604078464.

The previous prime is 681200561. The next prime is 681200621. The reversal of 681200591 is 195002186.

It is an interprime number because it is at equal distance from previous prime (681200561) and next prime (681200621).

It is a cyclic number.

It is not a de Polignac number, because 681200591 - 2²² = 677006287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681200561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13196 + ... + 39198.

It is an arithmetic number, because the mean of its divisors is an integer number (47743344).

Almost surely, 2^681200591 is an apocalyptic number.

681200591 is a deficient number, since it is larger than the sum of its proper divisors (82692913).

681200591 is a wasteful number, since it uses less digits than its factorization.

681200591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26110.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 681200591 is about 26099.8197503354. The cubic root of 681200591 is about 879.8831589879.

The spelling of 681200591 in words is "six hundred eighty-one million, two hundred thousand, five hundred ninety-one".