621069813 has 48 divisors (see below), whose sum is σ = 1122925440. Its totient is φ = 322019712.

The previous prime is 621069811. The next prime is 621069859. The reversal of 621069813 is 318960126.

It is not a de Polignac number, because 621069813 - 2¹ = 621069811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621069811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41895 + ... + 54747.

It is an arithmetic number, because the mean of its divisors is an integer number (23394280).

Almost surely, 2^621069813 is an apocalyptic number.

621069813 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

621069813 is a deficient number, since it is larger than the sum of its proper divisors (501855627).

621069813 is a wasteful number, since it uses less digits than its factorization.

621069813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12938 (or 12935 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 621069813 is about 24921.2722989818. The cubic root of 621069813 is about 853.1920635925.

The spelling of 621069813 in words is "six hundred twenty-one million, sixty-nine thousand, eight hundred thirteen".