621513401 has 2 divisors, whose sum is σ = 621513402. Its totient is φ = 621513400.

The previous prime is 621513397. The next prime is 621513437. The reversal of 621513401 is 104315126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 430521001 + 190992400 = 20749^2 + 13820^2 .

It is a cyclic number.

It is not a de Polignac number, because 621513401 - 2² = 621513397 is a prime.

It is not a weakly prime, because it can be changed into another prime (621513491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310756700 + 310756701.

It is an arithmetic number, because the mean of its divisors is an integer number (310756701).

Almost surely, 2^621513401 is an apocalyptic number.

It is an amenable number.

621513401 is a deficient number, since it is larger than the sum of its proper divisors (1).

621513401 is an equidigital number, since it uses as much as digits as its factorization.

621513401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 621513401 is about 24930.1704968097. The cubic root of 621513401 is about 853.3951409733.

Adding to 621513401 its reverse (104315126), we get a palindrome (725828527).

The spelling of 621513401 in words is "six hundred twenty-one million, five hundred thirteen thousand, four hundred one".