251080321 has 2 divisors, whose sum is σ = 251080322. Its totient is φ = 251080320.

The previous prime is 251080283. The next prime is 251080337. The reversal of 251080321 is 123080152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217149696 + 33930625 = 14736^2 + 5825^2 .

It is a cyclic number.

It is not a de Polignac number, because 251080321 - 2¹⁷ = 250949249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251080292 and 251080301.

It is not a weakly prime, because it can be changed into another prime (251080391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125540160 + 125540161.

It is an arithmetic number, because the mean of its divisors is an integer number (125540161).

Almost surely, 2^251080321 is an apocalyptic number.

It is an amenable number.

251080321 is a deficient number, since it is larger than the sum of its proper divisors (1).

251080321 is an equidigital number, since it uses as much as digits as its factorization.

251080321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 251080321 is about 15845.5142232747. The cubic root of 251080321 is about 630.8666337926.

The spelling of 251080321 in words is "two hundred fifty-one million, eighty thousand, three hundred twenty-one".