261135451 has 2 divisors, whose sum is σ = 261135452. Its totient is φ = 261135450.

The previous prime is 261135443. The next prime is 261135503. The reversal of 261135451 is 154531162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261135451 - 2³ = 261135443 is a prime.

It is not a weakly prime, because it can be changed into another prime (261135421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130567725 + 130567726.

It is an arithmetic number, because the mean of its divisors is an integer number (130567726).

Almost surely, 2^261135451 is an apocalyptic number.

261135451 is a deficient number, since it is larger than the sum of its proper divisors (1).

261135451 is an equidigital number, since it uses as much as digits as its factorization.

261135451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 261135451 is about 16159.6859808599. The cubic root of 261135451 is about 639.1781858956.

The spelling of 261135451 in words is "two hundred sixty-one million, one hundred thirty-five thousand, four hundred fifty-one".