621806997 has 16 divisors (see below), whose sum is σ = 950257152. Its totient is φ = 354290160.

The previous prime is 621806993. The next prime is 621807007. The reversal of 621806997 is 799608126.

It is not a de Polignac number, because 621806997 - 2² = 621806993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621806993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35379 + ... + 49952.

It is an arithmetic number, because the mean of its divisors is an integer number (59391072).

Almost surely, 2^621806997 is an apocalyptic number.

It is an amenable number.

621806997 is a deficient number, since it is larger than the sum of its proper divisors (328450155).

621806997 is a wasteful number, since it uses less digits than its factorization.

621806997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85688.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 621806997 is about 24936.0581688446. The cubic root of 621806997 is about 853.5294979353.

The spelling of 621806997 in words is "six hundred twenty-one million, eight hundred six thousand, nine hundred ninety-seven".