251323013 has 8 divisors (see below), whose sum is σ = 268176000. Its totient is φ = 234832608.

The previous prime is 251322997. The next prime is 251323043. The reversal of 251323013 is 310323152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251323013 - 2⁴ = 251322997 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 (251323043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89213 + ... + 91986.

It is an arithmetic number, because the mean of its divisors is an integer number (33522000).

Almost surely, 2^251323013 is an apocalyptic number.

It is an amenable number.

251323013 is a deficient number, since it is larger than the sum of its proper divisors (16852987).

251323013 is a wasteful number, since it uses less digits than its factorization.

251323013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181291.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 251323013 is about 15853.1704400098. The cubic root of 251323013 is about 631.0698316916.

Adding to 251323013 its reverse (310323152), we get a palindrome (561646165).

The spelling of 251323013 in words is "two hundred fifty-one million, three hundred twenty-three thousand, thirteen".