261129023 has 2 divisors, whose sum is σ = 261129024. Its totient is φ = 261129022.

The previous prime is 261129013. The next prime is 261129031. The reversal of 261129023 is 320921162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261129023 - 2⁴ = 261129007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261128983 and 261129001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261129013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130564511 + 130564512.

It is an arithmetic number, because the mean of its divisors is an integer number (130564512).

Almost surely, 2^261129023 is an apocalyptic number.

261129023 is a deficient number, since it is larger than the sum of its proper divisors (1).

261129023 is an equidigital number, since it uses as much as digits as its factorization.

261129023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 261129023 is about 16159.4870896325. The cubic root of 261129023 is about 639.1729412724.

The spelling of 261129023 in words is "two hundred sixty-one million, one hundred twenty-nine thousand, twenty-three".