641202761 has 2 divisors, whose sum is σ = 641202762. Its totient is φ = 641202760.

The previous prime is 641202739. The next prime is 641202773. The reversal of 641202761 is 167202146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491287225 + 149915536 = 22165^2 + 12244^2 .

It is a cyclic number.

It is not a de Polignac number, because 641202761 - 2¹⁸ = 640940617 is a prime.

It is a super-2 number, since 2×641202761² = 822281961428046242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641202701) 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, 320601380 + 320601381.

It is an arithmetic number, because the mean of its divisors is an integer number (320601381).

Almost surely, 2^641202761 is an apocalyptic number.

It is an amenable number.

641202761 is a deficient number, since it is larger than the sum of its proper divisors (1).

641202761 is an equidigital number, since it uses as much as digits as its factorization.

641202761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 641202761 is about 25321.9817747348. The cubic root of 641202761 is about 862.3133861054.

The spelling of 641202761 in words is "six hundred forty-one million, two hundred two thousand, seven hundred sixty-one".