261122977 has 2 divisors, whose sum is σ = 261122978. Its totient is φ = 261122976.

The previous prime is 261122963. The next prime is 261122987. The reversal of 261122977 is 779221162.

261122977 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., 227436561 + 33686416 = 15081^2 + 5804^2 .

It is a cyclic number.

It is not a de Polignac number, because 261122977 - 2¹⁵ = 261090209 is a prime.

It is not a weakly prime, because it can be changed into another prime (261122987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130561488 + 130561489.

It is an arithmetic number, because the mean of its divisors is an integer number (130561489).

Almost surely, 2^261122977 is an apocalyptic number.

It is an amenable number.

261122977 is a deficient number, since it is larger than the sum of its proper divisors (1).

261122977 is an equidigital number, since it uses as much as digits as its factorization.

261122977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 261122977 is about 16159.3000157804. The cubic root of 261122977 is about 639.1680082456.

The spelling of 261122977 in words is "two hundred sixty-one million, one hundred twenty-two thousand, nine hundred seventy-seven".