420250993 has 2 divisors, whose sum is σ = 420250994. Its totient is φ = 420250992.

The previous prime is 420250981. The next prime is 420251003. The reversal of 420250993 is 399052024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375468129 + 44782864 = 19377^2 + 6692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420250993 is a prime.

It is a super-2 number, since 2×420250993² = 353221794234972098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (420250903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210125496 + 210125497.

It is an arithmetic number, because the mean of its divisors is an integer number (210125497).

Almost surely, 2^420250993 is an apocalyptic number.

It is an amenable number.

420250993 is a deficient number, since it is larger than the sum of its proper divisors (1).

420250993 is an equidigital number, since it uses as much as digits as its factorization.

420250993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 420250993 is about 20500.0242194979. The cubic root of 420250993 is about 749.0363879475.

The spelling of 420250993 in words is "four hundred twenty million, two hundred fifty thousand, nine hundred ninety-three".