691204291401 has 64 divisors (see below), whose sum is σ = 1023402240000. Its totient is φ = 412364265984.

The previous prime is 691204291367. The next prime is 691204291403. The reversal of 691204291401 is 104192402196.

It is not a de Polignac number, because 691204291401 - 2²⁹ = 690667420489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 691204291401.

It is not an unprimeable number, because it can be changed into a prime (691204291403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 47016550 + ... + 47031248.

It is an arithmetic number, because the mean of its divisors is an integer number (15990660000).

Almost surely, 2^691204291401 is an apocalyptic number.

It is an amenable number.

691204291401 is a deficient number, since it is larger than the sum of its proper divisors (332197948599).

691204291401 is a wasteful number, since it uses less digits than its factorization.

691204291401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15070.

The product of its (nonzero) digits is 31104, while the sum is 39.

Adding to 691204291401 its reverse (104192402196), we get a palindrome (795396693597).

The spelling of 691204291401 in words is "six hundred ninety-one billion, two hundred four million, two hundred ninety-one thousand, four hundred one".