65251939 has 2 divisors, whose sum is σ = 65251940. Its totient is φ = 65251938.

The previous prime is 65251913. The next prime is 65251969. The reversal of 65251939 is 93915256.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65251939 - 2⁷ = 65251811 is a prime.

It is not a weakly prime, because it can be changed into another prime (65251969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32625969 + 32625970.

It is an arithmetic number, because the mean of its divisors is an integer number (32625970).

Almost surely, 2^65251939 is an apocalyptic number.

65251939 is a deficient number, since it is larger than the sum of its proper divisors (1).

65251939 is an equidigital number, since it uses as much as digits as its factorization.

65251939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72900, while the sum is 40.

The square root of 65251939 is about 8077.8672308970. The cubic root of 65251939 is about 402.5913818466.

It can be divided in two parts, 6525 and 1939, that added together give a square (8464 = 92²).

The spelling of 65251939 in words is "sixty-five million, two hundred fifty-one thousand, nine hundred thirty-nine".