42061631 has 4 divisors (see below), whose sum is σ = 42774600. Its totient is φ = 41348664.

The previous prime is 42061627. The next prime is 42061633. The reversal of 42061631 is 13616024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42061631 - 2² = 42061627 is a prime.

It is a super-2 number, since 2×42061631² = 3538361604760322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42061597 and 42061606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42061633) 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, 356396 + ... + 356513.

It is an arithmetic number, because the mean of its divisors is an integer number (10693650).

Almost surely, 2^42061631 is an apocalyptic number.

42061631 is a deficient number, since it is larger than the sum of its proper divisors (712969).

42061631 is an equidigital number, since it uses as much as digits as its factorization.

42061631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712968.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 42061631 is about 6485.4938902138. The cubic root of 42061631 is about 347.7726059931.

Adding to 42061631 its reverse (13616024), we get a palindrome (55677655).

The spelling of 42061631 in words is "forty-two million, sixty-one thousand, six hundred thirty-one".