691742589 has 8 divisors (see below), whose sum is σ = 922689792. Its totient is φ = 460978560.

The previous prime is 691742567. The next prime is 691742593. The reversal of 691742589 is 985247196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 691742589 - 2¹² = 691738493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691742509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36724 + ... + 52269.

It is an arithmetic number, because the mean of its divisors is an integer number (115336224).

Almost surely, 2^691742589 is an apocalyptic number.

It is an amenable number.

691742589 is a deficient number, since it is larger than the sum of its proper divisors (230947203).

691742589 is a wasteful number, since it uses less digits than its factorization.

691742589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91587.

The product of its digits is 1088640, while the sum is 51.

The square root of 691742589 is about 26300.9997718718. Note that the first 3 decimals coincide. The cubic root of 691742589 is about 884.3988550612.

The spelling of 691742589 in words is "six hundred ninety-one million, seven hundred forty-two thousand, five hundred eighty-nine".