65213531 has 2 divisors, whose sum is σ = 65213532. Its totient is φ = 65213530.

The previous prime is 65213527. The next prime is 65213537. The reversal of 65213531 is 13531256.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65213531 - 2² = 65213527 is a prime.

It is a super-2 number, since 2×65213531² = 8505609250975922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65213531.

It is not a weakly prime, because it can be changed into another prime (65213537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32606765 + 32606766.

It is an arithmetic number, because the mean of its divisors is an integer number (32606766).

Almost surely, 2^65213531 is an apocalyptic number.

65213531 is a deficient number, since it is larger than the sum of its proper divisors (1).

65213531 is an equidigital number, since it uses as much as digits as its factorization.

65213531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 65213531 is about 8075.4895207659. The cubic root of 65213531 is about 402.5123764567.

Adding to 65213531 its reverse (13531256), we get a palindrome (78744787).

The spelling of 65213531 in words is "sixty-five million, two hundred thirteen thousand, five hundred thirty-one".