689625019 has 2 divisors, whose sum is σ = 689625020. Its totient is φ = 689625018.

The previous prime is 689625011. The next prime is 689625137. The reversal of 689625019 is 910526986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689625019 - 2³ = 689625011 is a prime.

It is a super-2 number, since 2×689625019² = 951165333661500722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689625019.

It is not a weakly prime, because it can be changed into another prime (689625011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344812509 + 344812510.

It is an arithmetic number, because the mean of its divisors is an integer number (344812510).

Almost surely, 2^689625019 is an apocalyptic number.

689625019 is a deficient number, since it is larger than the sum of its proper divisors (1).

689625019 is an equidigital number, since it uses as much as digits as its factorization.

689625019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 689625019 is about 26260.7124617745. The cubic root of 689625019 is about 883.4954888101.

The spelling of 689625019 in words is "six hundred eighty-nine million, six hundred twenty-five thousand, nineteen".