509694023 has 4 divisors (see below), whose sum is σ = 509884608. Its totient is φ = 509503440.

The previous prime is 509693999. The next prime is 509694043. The reversal of 509694023 is 320496905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320496905 = 5 ⋅64099381.

It is a cyclic number.

It is not a de Polignac number, because 509694023 - 2²² = 505499719 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 (509694043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91223 + ... + 96648.

It is an arithmetic number, because the mean of its divisors is an integer number (127471152).

Almost surely, 2^509694023 is an apocalyptic number.

509694023 is a deficient number, since it is larger than the sum of its proper divisors (190585).

509694023 is a wasteful number, since it uses less digits than its factorization.

509694023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190584.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 509694023 is about 22576.4041202314. The cubic root of 509694023 is about 798.7971626969.

The spelling of 509694023 in words is "five hundred nine million, six hundred ninety-four thousand, twenty-three".