1304090261 has 2 divisors, whose sum is σ = 1304090262. Its totient is φ = 1304090260.

The previous prime is 1304090231. The next prime is 1304090267. The reversal of 1304090261 is 1620904031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1266648100 + 37442161 = 35590^2 + 6119^2 .

It is an emirp because it is prime and its reverse (1620904031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1304090261 - 2¹⁴ = 1304073877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1304090261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304090267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652045130 + 652045131.

It is an arithmetic number, because the mean of its divisors is an integer number (652045131).

Almost surely, 2^1304090261 is an apocalyptic number.

It is an amenable number.

1304090261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304090261 is an equidigital number, since it uses as much as digits as its factorization.

1304090261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1304090261 is about 36112.1899225179. The cubic root of 1304090261 is about 1092.5363210228.

Adding to 1304090261 its reverse (1620904031), we get a palindrome (2924994292).

It can be divided in two parts, 13040 and 90261, that added together give a palindrome (103301).

The spelling of 1304090261 in words is "one billion, three hundred four million, ninety thousand, two hundred sixty-one".