690139519 has 4 divisors (see below), whose sum is σ = 690645744. Its totient is φ = 689633296.

The previous prime is 690139517. The next prime is 690139547. The reversal of 690139519 is 915931096.

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 690139519 - 2¹ = 690139517 is a prime.

It is a super-2 number, since 2×690139519² = 952585111371102722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690139517) 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, 251062 + ... + 253795.

It is an arithmetic number, because the mean of its divisors is an integer number (172661436).

Almost surely, 2^690139519 is an apocalyptic number.

690139519 is a deficient number, since it is larger than the sum of its proper divisors (506225).

690139519 is a wasteful number, since it uses less digits than its factorization.

690139519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506224.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 690139519 is about 26270.5066376726. The cubic root of 690139519 is about 883.7151470403.

The spelling of 690139519 in words is "six hundred ninety million, one hundred thirty-nine thousand, five hundred nineteen".