691921514 has 16 divisors (see below), whose sum is σ = 1069789248. Its totient is φ = 335442912.

The previous prime is 691921507. The next prime is 691921541. The reversal of 691921514 is 415129196.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17582 + ... + 41145.

It is an arithmetic number, because the mean of its divisors is an integer number (66861828).

Almost surely, 2^691921514 is an apocalyptic number.

691921514 is a deficient number, since it is larger than the sum of its proper divisors (377867734).

691921514 is a wasteful number, since it uses less digits than its factorization.

691921514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58909.

The product of its digits is 19440, while the sum is 38.

The square root of 691921514 is about 26304.4010386095. The cubic root of 691921514 is about 884.4751008720.

The spelling of 691921514 in words is "six hundred ninety-one million, nine hundred twenty-one thousand, five hundred fourteen".