420913123 has 2 divisors, whose sum is σ = 420913124. Its totient is φ = 420913122.

The previous prime is 420913117. The next prime is 420913127. The reversal of 420913123 is 321319024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420913123 is a prime.

It is a super-2 number, since 2×420913123² = 354335714227226258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420913127) 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, 210456561 + 210456562.

It is an arithmetic number, because the mean of its divisors is an integer number (210456562).

Almost surely, 2^420913123 is an apocalyptic number.

420913123 is a deficient number, since it is larger than the sum of its proper divisors (1).

420913123 is an equidigital number, since it uses as much as digits as its factorization.

420913123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 420913123 is about 20516.1673565020. The cubic root of 420913123 is about 749.4295650635.

The spelling of 420913123 in words is "four hundred twenty million, nine hundred thirteen thousand, one hundred twenty-three".