65031961 has 2 divisors, whose sum is σ = 65031962. Its totient is φ = 65031960.

The previous prime is 65031959. The next prime is 65031979. The reversal of 65031961 is 16913056.

65031961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59598400 + 5433561 = 7720^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 65031961 - 2¹ = 65031959 is a prime.

Together with 65031959, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65031061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32515980 + 32515981.

It is an arithmetic number, because the mean of its divisors is an integer number (32515981).

Almost surely, 2^65031961 is an apocalyptic number.

It is an amenable number.

65031961 is a deficient number, since it is larger than the sum of its proper divisors (1).

65031961 is an equidigital number, since it uses as much as digits as its factorization.

65031961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 65031961 is about 8064.2396417765. The cubic root of 65031961 is about 402.1384657867.

It can be divided in two parts, 6503 and 1961, that added together give a square (8464 = 92²).

The spelling of 65031961 in words is "sixty-five million, thirty-one thousand, nine hundred sixty-one".