261295451 has 2 divisors, whose sum is σ = 261295452. Its totient is φ = 261295450.

The previous prime is 261295417. The next prime is 261295453. The reversal of 261295451 is 154592162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261295451 - 2¹⁰ = 261294427 is a prime.

Together with 261295453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261295453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130647725 + 130647726.

It is an arithmetic number, because the mean of its divisors is an integer number (130647726).

Almost surely, 2^261295451 is an apocalyptic number.

261295451 is a deficient number, since it is larger than the sum of its proper divisors (1).

261295451 is an equidigital number, since it uses as much as digits as its factorization.

261295451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 261295451 is about 16164.6358140232. The cubic root of 261295451 is about 639.3087026185.

The spelling of 261295451 in words is "two hundred sixty-one million, two hundred ninety-five thousand, four hundred fifty-one".