261231151 has 2 divisors, whose sum is σ = 261231152. Its totient is φ = 261231150.

The previous prime is 261231143. The next prime is 261231167. The reversal of 261231151 is 151132162.

It is a happy number.

261231151 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 261231151 - 2³ = 261231143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261235151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130615575 + 130615576.

It is an arithmetic number, because the mean of its divisors is an integer number (130615576).

Almost surely, 2^261231151 is an apocalyptic number.

261231151 is a deficient number, since it is larger than the sum of its proper divisors (1).

261231151 is an equidigital number, since it uses as much as digits as its factorization.

261231151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 261231151 is about 16162.6467820094. The cubic root of 261231151 is about 639.2562576157.

The spelling of 261231151 in words is "two hundred sixty-one million, two hundred thirty-one thousand, one hundred fifty-one".