42512031 has 12 divisors (see below), whose sum is σ = 62272080. Its totient is φ = 27941760.

The previous prime is 42512023. The next prime is 42512047. The reversal of 42512031 is 13021524.

It is not a de Polignac number, because 42512031 - 2³ = 42512023 is a prime.

It is a super-2 number, since 2×42512031² = 3614545559489922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42511995 and 42512013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42512081) 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, 32626 + ... + 33903.

It is an arithmetic number, because the mean of its divisors is an integer number (5189340).

Almost surely, 2^42512031 is an apocalyptic number.

42512031 is a deficient number, since it is larger than the sum of its proper divisors (19760049).

42512031 is a wasteful number, since it uses less digits than its factorization.

42512031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66606 (or 66603 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 42512031 is about 6520.1250754874. The cubic root of 42512031 is about 349.0095289446.

Adding to 42512031 its reverse (13021524), we get a palindrome (55533555).

The spelling of 42512031 in words is "forty-two million, five hundred twelve thousand, thirty-one".