691412645 has 16 divisors (see below), whose sum is σ = 1034425728. Its totient is φ = 431010240.

The previous prime is 691412639. The next prime is 691412651. The reversal of 691412645 is 546214196.

691412645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (691412639) and next prime (691412651).

It is not a de Polignac number, because 691412645 - 2⁶ = 691412581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691412599 and 691412608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 897554 + ... + 898323.

It is an arithmetic number, because the mean of its divisors is an integer number (64651608).

Almost surely, 2^691412645 is an apocalyptic number.

It is an amenable number.

691412645 is a deficient number, since it is larger than the sum of its proper divisors (343013083).

691412645 is a wasteful number, since it uses less digits than its factorization.

691412645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795900.

The product of its digits is 51840, while the sum is 38.

The square root of 691412645 is about 26294.7265625638. The cubic root of 691412645 is about 884.2582206177.

The spelling of 691412645 in words is "six hundred ninety-one million, four hundred twelve thousand, six hundred forty-five".