978251 has 4 divisors (see below), whose sum is σ = 980232. Its totient is φ = 976272.

The previous prime is 978239. The next prime is 978269. The reversal of 978251 is 152879.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978251 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978251.

It is not an unprimeable number, because it can be changed into a prime (978151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (245058).

2⁹⁷⁸²⁵¹ is an apocalyptic number.

978251 is a deficient number, since it is larger than the sum of its proper divisors (1981).

978251 is a wasteful number, since it uses less digits than its factorization.

978251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its digits is 5040, while the sum is 32.

The square root of 978251 is about 989.0657207688. The cubic root of 978251 is about 99.2697131267.

The spelling of 978251 in words is "nine hundred seventy-eight thousand, two hundred fifty-one".