620404091 has 2 divisors, whose sum is σ = 620404092. Its totient is φ = 620404090.

The previous prime is 620404073. The next prime is 620404159. The reversal of 620404091 is 190404026.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620404091 - 2¹⁴ = 620387707 is a prime.

It is a super-2 number, since 2×620404091² = 769802472259072562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 620404091.

It is not a weakly prime, because it can be changed into another prime (620404021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310202045 + 310202046.

It is an arithmetic number, because the mean of its divisors is an integer number (310202046).

Almost surely, 2^620404091 is an apocalyptic number.

620404091 is a deficient number, since it is larger than the sum of its proper divisors (1).

620404091 is an equidigital number, since it uses as much as digits as its factorization.

620404091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 620404091 is about 24907.9122168037. The cubic root of 620404091 is about 852.8871103341.

The spelling of 620404091 in words is "six hundred twenty million, four hundred four thousand, ninety-one".