420661457 has 2 divisors, whose sum is σ = 420661458. Its totient is φ = 420661456.

The previous prime is 420661453. The next prime is 420661469. The reversal of 420661457 is 754166024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404653456 + 16008001 = 20116^2 + 4001^2 .

It is a cyclic number.

It is not a de Polignac number, because 420661457 - 2² = 420661453 is a prime.

It is a super-2 number, since 2×420661457² = 353912122810725698, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420661453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210330728 + 210330729.

It is an arithmetic number, because the mean of its divisors is an integer number (210330729).

Almost surely, 2^420661457 is an apocalyptic number.

It is an amenable number.

420661457 is a deficient number, since it is larger than the sum of its proper divisors (1).

420661457 is an equidigital number, since it uses as much as digits as its factorization.

420661457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 420661457 is about 20510.0330813970. The cubic root of 420661457 is about 749.2801727601.

The spelling of 420661457 in words is "four hundred twenty million, six hundred sixty-one thousand, four hundred fifty-seven".