261154951 has 2 divisors, whose sum is σ = 261154952. Its totient is φ = 261154950.

The previous prime is 261154939. The next prime is 261154967. The reversal of 261154951 is 159451162.

It is a happy number.

261154951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261154951 - 2²⁵ = 227600519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261154921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130577475 + 130577476.

It is an arithmetic number, because the mean of its divisors is an integer number (130577476).

Almost surely, 2^261154951 is an apocalyptic number.

261154951 is a deficient number, since it is larger than the sum of its proper divisors (1).

261154951 is an equidigital number, since it uses as much as digits as its factorization.

261154951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 261154951 is about 16160.2893229051. The cubic root of 261154951 is about 639.1940954735.

The spelling of 261154951 in words is "two hundred sixty-one million, one hundred fifty-four thousand, nine hundred fifty-one".