259661397 has 4 divisors (see below), whose sum is σ = 346215200. Its totient is φ = 173107596.

The previous prime is 259661393. The next prime is 259661399. The reversal of 259661397 is 793166952.

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 not a de Polignac number, because 259661397 - 2² = 259661393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259661393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43276897 + ... + 43276902.

It is an arithmetic number, because the mean of its divisors is an integer number (86553800).

Almost surely, 2^259661397 is an apocalyptic number.

It is an amenable number.

259661397 is a deficient number, since it is larger than the sum of its proper divisors (86553803).

259661397 is an equidigital number, since it uses as much as digits as its factorization.

259661397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86553802.

The product of its digits is 612360, while the sum is 48.

The square root of 259661397 is about 16114.0124425917. The cubic root of 259661397 is about 637.9732409187.

The spelling of 259661397 in words is "two hundred fifty-nine million, six hundred sixty-one thousand, three hundred ninety-seven".