259147421 has 4 divisors (see below), whose sum is σ = 279081852. Its totient is φ = 239212992.

The previous prime is 259147409. The next prime is 259147423. The reversal of 259147421 is 124741952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114811225 + 144336196 = 10715^2 + 12014^2 .

It is a cyclic number.

It is not a de Polignac number, because 259147421 - 2¹⁰ = 259146397 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 (259147423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9967196 + ... + 9967221.

It is an arithmetic number, because the mean of its divisors is an integer number (69770463).

Almost surely, 2^259147421 is an apocalyptic number.

It is an amenable number.

259147421 is a deficient number, since it is larger than the sum of its proper divisors (19934431).

259147421 is a wasteful number, since it uses less digits than its factorization.

259147421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19934430.

The product of its digits is 20160, while the sum is 35.

The square root of 259147421 is about 16098.0564354831. The cubic root of 259147421 is about 637.5520263064.

The spelling of 259147421 in words is "two hundred fifty-nine million, one hundred forty-seven thousand, four hundred twenty-one".