261325097 has 4 divisors (see below), whose sum is σ = 285081936. Its totient is φ = 237568260.

The previous prime is 261325091. The next prime is 261325109. The reversal of 261325097 is 790523162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261325097 - 2¹⁶ = 261259561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261325091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11878403 + ... + 11878424.

It is an arithmetic number, because the mean of its divisors is an integer number (71270484).

Almost surely, 2^261325097 is an apocalyptic number.

It is an amenable number.

261325097 is a deficient number, since it is larger than the sum of its proper divisors (23756839).

261325097 is a wasteful number, since it uses less digits than its factorization.

261325097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23756838.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 261325097 is about 16165.5527898059. The cubic root of 261325097 is about 639.3328798847.

The spelling of 261325097 in words is "two hundred sixty-one million, three hundred twenty-five thousand, ninety-seven".