621528797 has 2 divisors, whose sum is σ = 621528798. Its totient is φ = 621528796.

The previous prime is 621528773. The next prime is 621528829. The reversal of 621528797 is 797825126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597606916 + 23921881 = 24446^2 + 4891^2 .

It is a cyclic number.

It is not a de Polignac number, because 621528797 - 2¹⁴ = 621512413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621528727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310764398 + 310764399.

It is an arithmetic number, because the mean of its divisors is an integer number (310764399).

Almost surely, 2^621528797 is an apocalyptic number.

It is an amenable number.

621528797 is a deficient number, since it is larger than the sum of its proper divisors (1).

621528797 is an equidigital number, since it uses as much as digits as its factorization.

621528797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 621528797 is about 24930.4792773825. The cubic root of 621528797 is about 853.4021876238.

The spelling of 621528797 in words is "six hundred twenty-one million, five hundred twenty-eight thousand, seven hundred ninety-seven".