261036091 has 2 divisors, whose sum is σ = 261036092. Its totient is φ = 261036090.

The previous prime is 261036043. The next prime is 261036103. The reversal of 261036091 is 190630162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261036091 - 2¹⁹ = 260511803 is a prime.

It is not a weakly prime, because it can be changed into another prime (261036011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130518045 + 130518046.

It is an arithmetic number, because the mean of its divisors is an integer number (130518046).

Almost surely, 2^261036091 is an apocalyptic number.

261036091 is a deficient number, since it is larger than the sum of its proper divisors (1).

261036091 is an equidigital number, since it uses as much as digits as its factorization.

261036091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 261036091 is about 16156.6113712003. The cubic root of 261036091 is about 639.0971081753.

The spelling of 261036091 in words is "two hundred sixty-one million, thirty-six thousand, ninety-one".