421261499 has 2 divisors, whose sum is σ = 421261500. Its totient is φ = 421261498.

The previous prime is 421261481. The next prime is 421261501. The reversal of 421261499 is 994162124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421261499 is a prime.

It is a super-2 number, since 2×421261499² = 354922501079454002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 421261501, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421261469) 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, 210630749 + 210630750.

It is an arithmetic number, because the mean of its divisors is an integer number (210630750).

Almost surely, 2^421261499 is an apocalyptic number.

421261499 is a deficient number, since it is larger than the sum of its proper divisors (1).

421261499 is an equidigital number, since it uses as much as digits as its factorization.

421261499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 421261499 is about 20524.6558801847. The cubic root of 421261499 is about 749.6362674786.

The spelling of 421261499 in words is "four hundred twenty-one million, two hundred sixty-one thousand, four hundred ninety-nine".