42609631 has 2 divisors, whose sum is σ = 42609632. Its totient is φ = 42609630.

The previous prime is 42609587. The next prime is 42609641. The reversal of 42609631 is 13690624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42609631 is a prime.

It is a super-2 number, since 2×42609631² = 3631161307912322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42609593 and 42609602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42609641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21304815 + 21304816.

It is an arithmetic number, because the mean of its divisors is an integer number (21304816).

Almost surely, 2^42609631 is an apocalyptic number.

42609631 is a deficient number, since it is larger than the sum of its proper divisors (1).

42609631 is an equidigital number, since it uses as much as digits as its factorization.

42609631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 42609631 is about 6527.6053036316. The cubic root of 42609631 is about 349.2764125746.

The spelling of 42609631 in words is "forty-two million, six hundred nine thousand, six hundred thirty-one".