2788129961 has 2 divisors, whose sum is σ = 2788129962. Its totient is φ = 2788129960.

The previous prime is 2788129951. The next prime is 2788129979. The reversal of 2788129961 is 1699218872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2006592025 + 781537936 = 44795^2 + 27956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2788129961 - 2²⁶ = 2721021097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2788129951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1394064980 + 1394064981.

It is an arithmetic number, because the mean of its divisors is an integer number (1394064981).

Almost surely, 2^2788129961 is an apocalyptic number.

It is an amenable number.

2788129961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2788129961 is an equidigital number, since it uses as much as digits as its factorization.

2788129961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The square root of 2788129961 is about 52802.7457714085. The cubic root of 2788129961 is about 1407.4652178843.

The spelling of 2788129961 in words is "two billion, seven hundred eighty-eight million, one hundred twenty-nine thousand, nine hundred sixty-one".