688242051 has 12 divisors (see below), whose sum is σ = 1136145712. Its totient is φ = 393281136.

The previous prime is 688242013. The next prime is 688242089. The reversal of 688242051 is 150242886.

It is an interprime number because it is at equal distance from previous prime (688242013) and next prime (688242089).

It is not a de Polignac number, because 688242051 - 2⁶ = 688241987 is a prime.

It is a super-3 number, since 3×688242051³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688241997 and 688242015.

It is not an unprimeable number, because it can be changed into a prime (688242091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5462176 + ... + 5462301.

Almost surely, 2^688242051 is an apocalyptic number.

688242051 is a deficient number, since it is larger than the sum of its proper divisors (447903661).

688242051 is a wasteful number, since it uses less digits than its factorization.

688242051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10924490 (or 10924487 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 688242051 is about 26234.3677453832. The cubic root of 688242051 is about 882.9045088686.

The spelling of 688242051 in words is "six hundred eighty-eight million, two hundred forty-two thousand, fifty-one".