65421397 has 2 divisors, whose sum is σ = 65421398. Its totient is φ = 65421396.

The previous prime is 65421373. The next prime is 65421409. The reversal of 65421397 is 79312456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55219761 + 10201636 = 7431^2 + 3194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65421397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65421197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32710698 + 32710699.

It is an arithmetic number, because the mean of its divisors is an integer number (32710699).

Almost surely, 2^65421397 is an apocalyptic number.

It is an amenable number.

65421397 is a deficient number, since it is larger than the sum of its proper divisors (1).

65421397 is an equidigital number, since it uses as much as digits as its factorization.

65421397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 65421397 is about 8088.3494607985. The cubic root of 65421397 is about 402.9395878878.

The spelling of 65421397 in words is "sixty-five million, four hundred twenty-one thousand, three hundred ninety-seven".