691899434 has 8 divisors (see below), whose sum is σ = 1037963460. Its totient is φ = 345911616.

The previous prime is 691899433. The next prime is 691899449. The reversal of 691899434 is 434998196.

It can be written as a sum of positive squares in 2 ways, for example, as 678758809 + 13140625 = 26053^2 + 3625^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (691899433) 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, 18272 + ... + 41444.

Almost surely, 2^691899434 is an apocalyptic number.

691899434 is a deficient number, since it is larger than the sum of its proper divisors (346064026).

691899434 is a wasteful number, since it uses less digits than its factorization.

691899434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38104.

The product of its digits is 1679616, while the sum is 53.

The square root of 691899434 is about 26303.9813336308. The cubic root of 691899434 is about 884.4656925708.

The spelling of 691899434 in words is "six hundred ninety-one million, eight hundred ninety-nine thousand, four hundred thirty-four".