420356491 has 2 divisors, whose sum is σ = 420356492. Its totient is φ = 420356490.

The previous prime is 420356471. The next prime is 420356539. The reversal of 420356491 is 194653024.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420356491 is a prime.

It is not a weakly prime, because it can be changed into another prime (420356471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210178245 + 210178246.

It is an arithmetic number, because the mean of its divisors is an integer number (210178246).

Almost surely, 2^420356491 is an apocalyptic number.

420356491 is a deficient number, since it is larger than the sum of its proper divisors (1).

420356491 is an equidigital number, since it uses as much as digits as its factorization.

420356491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 420356491 is about 20502.5971769432. The cubic root of 420356491 is about 749.0990609934.

The spelling of 420356491 in words is "four hundred twenty million, three hundred fifty-six thousand, four hundred ninety-one".