691014055 has 4 divisors (see below), whose sum is σ = 829216872. Its totient is φ = 552811240.

The previous prime is 691014031. The next prime is 691014061. The reversal of 691014055 is 550410196.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 691014055 - 2²⁷ = 556796327 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69101401 + ... + 69101410.

It is an arithmetic number, because the mean of its divisors is an integer number (207304218).

Almost surely, 2^691014055 is an apocalyptic number.

691014055 is a deficient number, since it is larger than the sum of its proper divisors (138202817).

691014055 is a wasteful number, since it uses less digits than its factorization.

691014055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138202816.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 691014055 is about 26287.1461935296. The cubic root of 691014055 is about 884.0882670031.

The spelling of 691014055 in words is "six hundred ninety-one million, fourteen thousand, fifty-five".