431209857523 has 4 divisors (see below), whose sum is σ = 431211800448. Its totient is φ = 431207914600.

The previous prime is 431209857509. The next prime is 431209857577. The reversal of 431209857523 is 325758902134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325758902134 = 2 ⋅162879451067.

It is a cyclic number.

It is not a de Polignac number, because 431209857523 - 2⁹ = 431209857011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431209857823) 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, 588136 + ... + 1099237.

It is an arithmetic number, because the mean of its divisors is an integer number (107802950112).

Almost surely, 2^431209857523 is an apocalyptic number.

431209857523 is a deficient number, since it is larger than the sum of its proper divisors (1942925).

431209857523 is a wasteful number, since it uses less digits than its factorization.

431209857523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942924.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 431209857523 in words is "four hundred thirty-one billion, two hundred nine million, eight hundred fifty-seven thousand, five hundred twenty-three".