621247797 has 12 divisors (see below), whose sum is σ = 921611340. Its totient is φ = 402971328.

The previous prime is 621247787. The next prime is 621247811. The reversal of 621247797 is 797742126.

It can be written as a sum of positive squares in 2 ways, for example, as 569967876 + 51279921 = 23874^2 + 7161^2 .

It is not a de Polignac number, because 621247797 - 2¹⁵ = 621215029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621247727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 932472 + ... + 933137.

It is an arithmetic number, because the mean of its divisors is an integer number (76800945).

Almost surely, 2^621247797 is an apocalyptic number.

It is an amenable number.

621247797 is a deficient number, since it is larger than the sum of its proper divisors (300363543).

621247797 is a wasteful number, since it uses less digits than its factorization.

621247797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865652 (or 1865649 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 621247797 is about 24924.8429684121. The cubic root of 621247797 is about 853.2735574007.

The spelling of 621247797 in words is "six hundred twenty-one million, two hundred forty-seven thousand, seven hundred ninety-seven".