42245631 has 10 divisors (see below), whose sum is σ = 63107792. Its totient is φ = 28163700.

The previous prime is 42245627. The next prime is 42245647. The reversal of 42245631 is 13654224.

42245631 is a `hidden beast` number, since 4 + 2 + 24 + 5 + 631 = 666.

It is not a de Polignac number, because 42245631 - 2² = 42245627 is a prime.

It is a super-2 number, since 2×42245631² = 3569386677176322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42245595 and 42245604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42245681) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 260695 + ... + 260856.

Almost surely, 2^42245631 is an apocalyptic number.

42245631 is a deficient number, since it is larger than the sum of its proper divisors (20862161).

42245631 is an equidigital number, since it uses as much as digits as its factorization.

42245631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521563 (or 521554 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 42245631 is about 6499.6639143882. The cubic root of 42245631 is about 348.2789825891.

Adding to 42245631 its reverse (13654224), we get a palindrome (55899855).

The spelling of 42245631 in words is "forty-two million, two hundred forty-five thousand, six hundred thirty-one".