688474531 has 4 divisors (see below), whose sum is σ = 691481200. Its totient is φ = 685467864.

The previous prime is 688474511. The next prime is 688474537. The reversal of 688474531 is 135474886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135474886 = 2 ⋅67737443.

It is a cyclic number.

It is not a de Polignac number, because 688474531 - 2²¹ = 686377379 is a prime.

It is a super-2 number, since 2×688474531² = 947994359671339922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688474537) 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, 1502991 + ... + 1503448.

It is an arithmetic number, because the mean of its divisors is an integer number (172870300).

Almost surely, 2^688474531 is an apocalyptic number.

688474531 is a deficient number, since it is larger than the sum of its proper divisors (3006669).

688474531 is a wasteful number, since it uses less digits than its factorization.

688474531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006668.

The product of its digits is 645120, while the sum is 46.

The square root of 688474531 is about 26238.7982003750. The cubic root of 688474531 is about 883.0039092337.

The spelling of 688474531 in words is "six hundred eighty-eight million, four hundred seventy-four thousand, five hundred thirty-one".