251328463 has 4 divisors (see below), whose sum is σ = 252604440. Its totient is φ = 250052488.

The previous prime is 251328461. The next prime is 251328499. The reversal of 251328463 is 364823152.

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

It is a cyclic number.

It is not a de Polignac number, because 251328463 - 2¹ = 251328461 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 (251328461) 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, 637693 + ... + 638086.

It is an arithmetic number, because the mean of its divisors is an integer number (63151110).

Almost surely, 2^251328463 is an apocalyptic number.

251328463 is a deficient number, since it is larger than the sum of its proper divisors (1275977).

251328463 is a wasteful number, since it uses less digits than its factorization.

251328463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275976.

The product of its digits is 34560, while the sum is 34.

The square root of 251328463 is about 15853.3423289854. The cubic root of 251328463 is about 631.0743932924.

It can be divided in two parts, 2513 and 28463, that added together give a square (30976 = 176²).

The spelling of 251328463 in words is "two hundred fifty-one million, three hundred twenty-eight thousand, four hundred sixty-three".