691770423 has 4 divisors (see below), whose sum is σ = 922360568. Its totient is φ = 461180280.

The previous prime is 691770421. The next prime is 691770427. The reversal of 691770423 is 324077196.

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

It is not a de Polignac number, because 691770423 - 2¹ = 691770421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691770421) 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, 115295068 + ... + 115295073.

It is an arithmetic number, because the mean of its divisors is an integer number (230590142).

Almost surely, 2^691770423 is an apocalyptic number.

691770423 is a deficient number, since it is larger than the sum of its proper divisors (230590145).

691770423 is a wasteful number, since it uses less digits than its factorization.

691770423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230590144.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 691770423 is about 26301.5289099322. The cubic root of 691770423 is about 884.4107169050.

The spelling of 691770423 in words is "six hundred ninety-one million, seven hundred seventy thousand, four hundred twenty-three".