699031391 has 4 divisors (see below), whose sum is σ = 710490984. Its totient is φ = 687571800.

The previous prime is 699031379. The next prime is 699031393. The reversal of 699031391 is 193130996.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-699031391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699031393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5729705 + ... + 5729826.

It is an arithmetic number, because the mean of its divisors is an integer number (177622746).

Almost surely, 2^699031391 is an apocalyptic number.

699031391 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

699031391 is a deficient number, since it is larger than the sum of its proper divisors (11459593).

699031391 is a wasteful number, since it uses less digits than its factorization.

699031391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11459592.

The product of its (nonzero) digits is 39366, while the sum is 41.

The square root of 699031391 is about 26439.2017844715. The cubic root of 699031391 is about 887.4942737447.

The spelling of 699031391 in words is "six hundred ninety-nine million, thirty-one thousand, three hundred ninety-one".