261294889 has 2 divisors, whose sum is σ = 261294890. Its totient is φ = 261294888.

The previous prime is 261294853. The next prime is 261294907. The reversal of 261294889 is 988492162.

261294889 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., 222755625 + 38539264 = 14925^2 + 6208^2 .

It is a cyclic number.

It is not a de Polignac number, because 261294889 - 2¹⁵ = 261262121 is a prime.

It is not a weakly prime, because it can be changed into another prime (261294809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130647444 + 130647445.

It is an arithmetic number, because the mean of its divisors is an integer number (130647445).

Almost surely, 2^261294889 is an apocalyptic number.

It is an amenable number.

261294889 is a deficient number, since it is larger than the sum of its proper divisors (1).

261294889 is an equidigital number, since it uses as much as digits as its factorization.

261294889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The square root of 261294889 is about 16164.6184303868. The cubic root of 261294889 is about 639.3082442718.

The spelling of 261294889 in words is "two hundred sixty-one million, two hundred ninety-four thousand, eight hundred eighty-nine".