261451129 has 2 divisors, whose sum is σ = 261451130. Its totient is φ = 261451128.

The previous prime is 261451123. The next prime is 261451163. The reversal of 261451129 is 921154162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159441129 + 102010000 = 12627^2 + 10100^2 .

It is a cyclic number.

It is not a de Polignac number, because 261451129 - 2¹¹ = 261449081 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261451129.

It is not a weakly prime, because it can be changed into another prime (261451123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130725564 + 130725565.

It is an arithmetic number, because the mean of its divisors is an integer number (130725565).

Almost surely, 2^261451129 is an apocalyptic number.

It is an amenable number.

261451129 is a deficient number, since it is larger than the sum of its proper divisors (1).

261451129 is an equidigital number, since it uses as much as digits as its factorization.

261451129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 261451129 is about 16169.4504854061. The cubic root of 261451129 is about 639.4356426279.

The spelling of 261451129 in words is "two hundred sixty-one million, four hundred fifty-one thousand, one hundred twenty-nine".