1361220761 has 2 divisors, whose sum is σ = 1361220762. Its totient is φ = 1361220760.

The previous prime is 1361220739. The next prime is 1361220769. The reversal of 1361220761 is 1670221631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230255625 + 130965136 = 35075^2 + 11444^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361220761 - 2⁶ = 1361220697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361220769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680610380 + 680610381.

It is an arithmetic number, because the mean of its divisors is an integer number (680610381).

Almost surely, 2^1361220761 is an apocalyptic number.

It is an amenable number.

1361220761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361220761 is an equidigital number, since it uses as much as digits as its factorization.

1361220761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1361220761 is about 36894.7253818212. The cubic root of 1361220761 is about 1108.2630521524.

The spelling of 1361220761 in words is "one billion, three hundred sixty-one million, two hundred twenty thousand, seven hundred sixty-one".