680515531 has 4 divisors (see below), whose sum is σ = 681695512. Its totient is φ = 679335552.

The previous prime is 680515529. The next prime is 680515543. The reversal of 680515531 is 135515086.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 680515531 - 2¹ = 680515529 is a prime.

It is a super-3 number, since 3×680515531³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680515331) 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, 589125 + ... + 590278.

It is an arithmetic number, because the mean of its divisors is an integer number (170423878).

Almost surely, 2^680515531 is an apocalyptic number.

680515531 is a deficient number, since it is larger than the sum of its proper divisors (1179981).

680515531 is a wasteful number, since it uses less digits than its factorization.

680515531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179980.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 680515531 is about 26086.6926037012. The cubic root of 680515531 is about 879.5881039824.

The spelling of 680515531 in words is "six hundred eighty million, five hundred fifteen thousand, five hundred thirty-one".