621140389 has 2 divisors, whose sum is σ = 621140390. Its totient is φ = 621140388.

The previous prime is 621140383. The next prime is 621140393. The reversal of 621140389 is 983041126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417507489 + 203632900 = 20433^2 + 14270^2 .

It is a cyclic number.

It is not a de Polignac number, because 621140389 - 2²³ = 612751781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621140383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310570194 + 310570195.

It is an arithmetic number, because the mean of its divisors is an integer number (310570195).

Almost surely, 2^621140389 is an apocalyptic number.

It is an amenable number.

621140389 is a deficient number, since it is larger than the sum of its proper divisors (1).

621140389 is an equidigital number, since it uses as much as digits as its factorization.

621140389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 621140389 is about 24922.6882378286. The cubic root of 621140389 is about 853.2243801969.

The spelling of 621140389 in words is "six hundred twenty-one million, one hundred forty thousand, three hundred eighty-nine".