620813911 has 8 divisors (see below), whose sum is σ = 623637344. Its totient is φ = 617997600.

The previous prime is 620813899. The next prime is 620813917. The reversal of 620813911 is 119318026.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620813911 - 2¹⁵ = 620781143 is a prime.

It is a super-2 number, since 2×620813911² = 770819824182231842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620813917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242086 + ... + 244636.

It is an arithmetic number, because the mean of its divisors is an integer number (77954668).

Almost surely, 2^620813911 is an apocalyptic number.

620813911 is a deficient number, since it is larger than the sum of its proper divisors (2823433).

620813911 is a wasteful number, since it uses less digits than its factorization.

620813911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 620813911 is about 24916.1375618293. The cubic root of 620813911 is about 853.0748660597.

The spelling of 620813911 in words is "six hundred twenty million, eight hundred thirteen thousand, nine hundred eleven".