426155621 has 2 divisors, whose sum is σ = 426155622. Its totient is φ = 426155620.

The previous prime is 426155591. The next prime is 426155633. The reversal of 426155621 is 126551624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245548900 + 180606721 = 15670^2 + 13439^2 .

It is a cyclic number.

It is not a de Polignac number, because 426155621 - 2⁶ = 426155557 is a prime.

It is a super-2 number, since 2×426155621² = 363217226619791282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426155021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213077810 + 213077811.

It is an arithmetic number, because the mean of its divisors is an integer number (213077811).

Almost surely, 2^426155621 is an apocalyptic number.

It is an amenable number.

426155621 is a deficient number, since it is larger than the sum of its proper divisors (1).

426155621 is an equidigital number, since it uses as much as digits as its factorization.

426155621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

The square root of 426155621 is about 20643.5370273604. The cubic root of 426155621 is about 752.5281327804.

The spelling of 426155621 in words is "four hundred twenty-six million, one hundred fifty-five thousand, six hundred twenty-one".