42551631 has 12 divisors (see below), whose sum is σ = 61548552. Its totient is φ = 28328496.

The previous prime is 42551611. The next prime is 42551647. The reversal of 42551631 is 13615524.

42551631 is a `hidden beast` number, since 4 + 25 + 5 + 1 + 631 = 666.

It is not a de Polignac number, because 42551631 - 2¹⁹ = 42027343 is a prime.

It is a super-2 number, since 2×42551631² = 3621282601520322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42551595 and 42551604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42551611) 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, 4585 + ... + 10301.

It is an arithmetic number, because the mean of its divisors is an integer number (5129046).

Almost surely, 2^42551631 is an apocalyptic number.

42551631 is a deficient number, since it is larger than the sum of its proper divisors (18996921).

42551631 is a wasteful number, since it uses less digits than its factorization.

42551631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6550 (or 6547 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 42551631 is about 6523.1611201932. The cubic root of 42551631 is about 349.1178628905.

It can be divided in two parts, 4255 and 1631, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 42551631 in words is "forty-two million, five hundred fifty-one thousand, six hundred thirty-one".