687451361 has 4 divisors (see below), whose sum is σ = 687681792. Its totient is φ = 687220932.

The previous prime is 687451343. The next prime is 687451399. The reversal of 687451361 is 163154786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687451361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687451861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110681 + ... + 116726.

It is an arithmetic number, because the mean of its divisors is an integer number (171920448).

Almost surely, 2^687451361 is an apocalyptic number.

It is an amenable number.

687451361 is a deficient number, since it is larger than the sum of its proper divisors (230431).

687451361 is a wasteful number, since it uses less digits than its factorization.

687451361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230430.

The product of its digits is 120960, while the sum is 41.

The square root of 687451361 is about 26219.2936785109. The cubic root of 687451361 is about 882.5662696906.

The spelling of 687451361 in words is "six hundred eighty-seven million, four hundred fifty-one thousand, three hundred sixty-one".