626901421 has 2 divisors, whose sum is σ = 626901422. Its totient is φ = 626901420.

The previous prime is 626901413. The next prime is 626901479. The reversal of 626901421 is 124109626.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596043396 + 30858025 = 24414^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 626901421 - 2³ = 626901413 is a prime.

It is equal to p_32654137 and since 626901421 and 32654137 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626901481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313450710 + 313450711.

It is an arithmetic number, because the mean of its divisors is an integer number (313450711).

Almost surely, 2^626901421 is an apocalyptic number.

It is an amenable number.

626901421 is a deficient number, since it is larger than the sum of its proper divisors (1).

626901421 is an equidigital number, since it uses as much as digits as its factorization.

626901421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 626901421 is about 25037.9995406981. Note that the first 3 decimals coincide. The cubic root of 626901421 is about 855.8541313479.

The spelling of 626901421 in words is "six hundred twenty-six million, nine hundred one thousand, four hundred twenty-one".