65931421 has 2 divisors, whose sum is σ = 65931422. Its totient is φ = 65931420.

The previous prime is 65931407. The next prime is 65931449. The reversal of 65931421 is 12413956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42068196 + 23863225 = 6486^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 65931421 - 2⁷ = 65931293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65931401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32965710 + 32965711.

It is an arithmetic number, because the mean of its divisors is an integer number (32965711).

Almost surely, 2^65931421 is an apocalyptic number.

It is an amenable number.

65931421 is a deficient number, since it is larger than the sum of its proper divisors (1).

65931421 is an equidigital number, since it uses as much as digits as its factorization.

65931421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 65931421 is about 8119.8165619674. The cubic root of 65931421 is about 403.9839817359.

The spelling of 65931421 in words is "sixty-five million, nine hundred thirty-one thousand, four hundred twenty-one".