258742509 has 4 divisors (see below), whose sum is σ = 344990016. Its totient is φ = 172495004.

The previous prime is 258742493. The next prime is 258742529. The reversal of 258742509 is 905247852.

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 258742509 - 2⁴ = 258742493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258742529) 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, 43123749 + ... + 43123754.

It is an arithmetic number, because the mean of its divisors is an integer number (86247504).

Almost surely, 2^258742509 is an apocalyptic number.

It is an amenable number.

258742509 is a deficient number, since it is larger than the sum of its proper divisors (86247507).

258742509 is an equidigital number, since it uses as much as digits as its factorization.

258742509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86247506.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 258742509 is about 16085.4750940095. The cubic root of 258742509 is about 637.2197996605.

The spelling of 258742509 in words is "two hundred fifty-eight million, seven hundred forty-two thousand, five hundred nine".