65031945 has 32 divisors (see below), whose sum is σ = 116290944. Its totient is φ = 30758400.

The previous prime is 65031881. The next prime is 65031959. The reversal of 65031945 is 54913056.

It is a happy number.

It is not a de Polignac number, because 65031945 - 2⁶ = 65031881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1959 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (3634092).

Almost surely, 2^65031945 is an apocalyptic number.

It is an amenable number.

65031945 is a deficient number, since it is larger than the sum of its proper divisors (51258999).

65031945 is a wasteful number, since it uses less digits than its factorization.

65031945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9673.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 65031945 is about 8064.2386497425. The cubic root of 65031945 is about 402.1384328069.

It can be divided in two parts, 6503 and 1945, that added together give a palindrome (8448).

The spelling of 65031945 in words is "sixty-five million, thirty-one thousand, nine hundred forty-five".