662931421 has 2 divisors, whose sum is σ = 662931422. Its totient is φ = 662931420.

The previous prime is 662931407. The next prime is 662931431. The reversal of 662931421 is 124139266.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648262521 + 14668900 = 25461^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 662931421 - 2²⁵ = 629376989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662931431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331465710 + 331465711.

It is an arithmetic number, because the mean of its divisors is an integer number (331465711).

Almost surely, 2^662931421 is an apocalyptic number.

It is an amenable number.

662931421 is a deficient number, since it is larger than the sum of its proper divisors (1).

662931421 is an equidigital number, since it uses as much as digits as its factorization.

662931421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 662931421 is about 25747.4546508970. The cubic root of 662931421 is about 871.9458893316.

The spelling of 662931421 in words is "six hundred sixty-two million, nine hundred thirty-one thousand, four hundred twenty-one".