691056059 has 4 divisors (see below), whose sum is σ = 691163616. Its totient is φ = 690948504.

The previous prime is 691056031. The next prime is 691056071. The reversal of 691056059 is 950650196.

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

It is a cyclic number.

It is not a de Polignac number, because 691056059 - 2¹⁶ = 690990523 is a prime.

It is a super-2 number, since 2×691056059² = 955116953361222962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691056089) 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, 43484 + ... + 57209.

It is an arithmetic number, because the mean of its divisors is an integer number (172790904).

Almost surely, 2^691056059 is an apocalyptic number.

691056059 is a deficient number, since it is larger than the sum of its proper divisors (107557).

691056059 is a wasteful number, since it uses less digits than its factorization.

691056059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107556.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 691056059 is about 26287.9451269969. The cubic root of 691056059 is about 884.1061800450.

The spelling of 691056059 in words is "six hundred ninety-one million, fifty-six thousand, fifty-nine".