42523131 has 12 divisors (see below), whose sum is σ = 65954472. Its totient is φ = 24298848.

The previous prime is 42523123. The next prime is 42523139. The reversal of 42523131 is 13132524.

It is an interprime number because it is at equal distance from previous prime (42523123) and next prime (42523139).

It is not a de Polignac number, because 42523131 - 2³ = 42523123 is a prime.

It is a super-2 number, since 2×42523131² = 3616433340086322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 42523098 and 42523107.

It is not an unprimeable number, because it can be changed into a prime (42523139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144490 + ... + 144783.

It is an arithmetic number, because the mean of its divisors is an integer number (5496206).

Almost surely, 2^42523131 is an apocalyptic number.

42523131 is a deficient number, since it is larger than the sum of its proper divisors (23431341).

42523131 is a wasteful number, since it uses less digits than its factorization.

42523131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289290 (or 289283 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 42523131 is about 6520.9762305962. The cubic root of 42523131 is about 349.0399020614.

Adding to 42523131 its reverse (13132524), we get a palindrome (55655655).

The spelling of 42523131 in words is "forty-two million, five hundred twenty-three thousand, one hundred thirty-one".