2261269561 has 2 divisors, whose sum is σ = 2261269562. Its totient is φ = 2261269560.

The previous prime is 2261269537. The next prime is 2261269601. The reversal of 2261269561 is 1659621622.

It is an a-pointer prime, because the next prime (2261269601) can be obtained adding 2261269561 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2259195961 + 2073600 = 47531^2 + 1440^2 .

It is a cyclic number.

It is not a de Polignac number, because 2261269561 - 2¹¹ = 2261267513 is a prime.

It is a super-2 number, since 2×2261269561² = 10226680055010265442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2261269511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130634780 + 1130634781.

It is an arithmetic number, because the mean of its divisors is an integer number (1130634781).

Almost surely, 2^2261269561 is an apocalyptic number.

It is an amenable number.

2261269561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261269561 is an equidigital number, since it uses as much as digits as its factorization.

2261269561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 2261269561 is about 47552.8081294891. The cubic root of 2261269561 is about 1312.5548031659.

The spelling of 2261269561 in words is "two billion, two hundred sixty-one million, two hundred sixty-nine thousand, five hundred sixty-one".