2640561929 has 2 divisors, whose sum is σ = 2640561930. Its totient is φ = 2640561928.

The previous prime is 2640561899. The next prime is 2640561947. The reversal of 2640561929 is 9291650462.

2640561929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2405706304 + 234855625 = 49048^2 + 15325^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640561929 - 2²⁰ = 2639513353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2640561929.

It is not a weakly prime, because it can be changed into another prime (2640561949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320280964 + 1320280965.

It is an arithmetic number, because the mean of its divisors is an integer number (1320280965).

Almost surely, 2^2640561929 is an apocalyptic number.

It is an amenable number.

2640561929 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640561929 is an equidigital number, since it uses as much as digits as its factorization.

2640561929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 2640561929 is about 51386.3982878738. The cubic root of 2640561929 is about 1382.1826988238.

The spelling of 2640561929 in words is "two billion, six hundred forty million, five hundred sixty-one thousand, nine hundred twenty-nine".