621771431 has 2 divisors, whose sum is σ = 621771432. Its totient is φ = 621771430.

The previous prime is 621771419. The next prime is 621771439. The reversal of 621771431 is 134177126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621771431 - 2¹⁴ = 621755047 is a prime.

It is a super-2 number, since 2×621771431² = 773199424815575522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621771439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310885715 + 310885716.

It is an arithmetic number, because the mean of its divisors is an integer number (310885716).

Almost surely, 2^621771431 is an apocalyptic number.

621771431 is a deficient number, since it is larger than the sum of its proper divisors (1).

621771431 is an equidigital number, since it uses as much as digits as its factorization.

621771431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 621771431 is about 24935.3450146574. The cubic root of 621771431 is about 853.5132242850.

The spelling of 621771431 in words is "six hundred twenty-one million, seven hundred seventy-one thousand, four hundred thirty-one".