65442531 has 32 divisors (see below), whose sum is σ = 112550400. Its totient is φ = 32820480.

The previous prime is 65442523. The next prime is 65442539. The reversal of 65442531 is 13524456.

It is an interprime number because it is at equal distance from previous prime (65442523) and next prime (65442539).

It is not a de Polignac number, because 65442531 - 2³ = 65442523 is a prime.

It is a super-2 number, since 2×65442531² = 8565449727371922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65442539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1815 + ... + 11583.

It is an arithmetic number, because the mean of its divisors is an integer number (3517200).

Almost surely, 2^65442531 is an apocalyptic number.

65442531 is a deficient number, since it is larger than the sum of its proper divisors (47107869).

65442531 is a wasteful number, since it uses less digits than its factorization.

65442531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9819.

The product of its digits is 14400, while the sum is 30.

The square root of 65442531 is about 8089.6558023194. The cubic root of 65442531 is about 402.9829723095.

Adding to 65442531 its reverse (13524456), we get a palindrome (78966987).

It can be divided in two parts, 654425 and 31, that added together give a palindrome (654456).

The spelling of 65442531 in words is "sixty-five million, four hundred forty-two thousand, five hundred thirty-one".