691059027 has 16 divisors (see below), whose sum is σ = 1001983392. Its totient is φ = 421885440.

The previous prime is 691059023. The next prime is 691059077. The reversal of 691059027 is 720950196.

It is not a de Polignac number, because 691059027 - 2² = 691059023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691059023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181224 + ... + 184997.

It is an arithmetic number, because the mean of its divisors is an integer number (62623962).

Almost surely, 2^691059027 is an apocalyptic number.

691059027 is a deficient number, since it is larger than the sum of its proper divisors (310924365).

691059027 is a wasteful number, since it uses less digits than its factorization.

691059027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366278.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 691059027 is about 26288.0015786670. The cubic root of 691059027 is about 884.1074457519.

The spelling of 691059027 in words is "six hundred ninety-one million, fifty-nine thousand, twenty-seven".