691247107 has 4 divisors (see below), whose sum is σ = 701564296. Its totient is φ = 680929920.

The previous prime is 691247093. The next prime is 691247143. The reversal of 691247107 is 701742196.

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-691247107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691247177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5158494 + ... + 5158627.

It is an arithmetic number, because the mean of its divisors is an integer number (175391074).

Almost surely, 2^691247107 is an apocalyptic number.

691247107 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

691247107 is a deficient number, since it is larger than the sum of its proper divisors (10317189).

691247107 is a wasteful number, since it uses less digits than its factorization.

691247107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10317188.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 691247107 is about 26291.5786327105. The cubic root of 691247107 is about 884.1876452905.

The spelling of 691247107 in words is "six hundred ninety-one million, two hundred forty-seven thousand, one hundred seven".