691412641 has 8 divisors (see below), whose sum is σ = 728048480. Its totient is φ = 654801408.

The previous prime is 691412639. The next prime is 691412651. The reversal of 691412641 is 146214196.

It is a happy number.

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

It is not a de Polignac number, because 691412641 - 2¹ = 691412639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691412597 and 691412606.

It is not an unprimeable number, because it can be changed into a prime (691412611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91105 + ... + 98401.

It is an arithmetic number, because the mean of its divisors is an integer number (91006060).

Almost surely, 2^691412641 is an apocalyptic number.

It is an amenable number.

691412641 is a deficient number, since it is larger than the sum of its proper divisors (36635839).

691412641 is a wasteful number, since it uses less digits than its factorization.

691412641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12303.

The product of its digits is 10368, while the sum is 34.

The square root of 691412641 is about 26294.7264865030. The cubic root of 691412641 is about 884.2582189125.

The spelling of 691412641 in words is "six hundred ninety-one million, four hundred twelve thousand, six hundred forty-one".