261154939 has 2 divisors, whose sum is σ = 261154940. Its totient is φ = 261154938.

The previous prime is 261154921. The next prime is 261154951. The reversal of 261154939 is 939451162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261154939 - 2¹⁵ = 261122171 is a prime.

It is not a weakly prime, because it can be changed into another prime (261154139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130577469 + 130577470.

It is an arithmetic number, because the mean of its divisors is an integer number (130577470).

Almost surely, 2^261154939 is an apocalyptic number.

261154939 is a deficient number, since it is larger than the sum of its proper divisors (1).

261154939 is an equidigital number, since it uses as much as digits as its factorization.

261154939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 261154939 is about 16160.2889516246. The cubic root of 261154939 is about 639.1940856832.

The spelling of 261154939 in words is "two hundred sixty-one million, one hundred fifty-four thousand, nine hundred thirty-nine".