249970321 has 2 divisors, whose sum is σ = 249970322. Its totient is φ = 249970320.

The previous prime is 249970307. The next prime is 249970379. The reversal of 249970321 is 123079942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202208400 + 47761921 = 14220^2 + 6911^2 .

It is a cyclic number.

It is not a de Polignac number, because 249970321 - 2¹¹ = 249968273 is a prime.

It is a super-2 number, since 2×249970321² = 124970322761686082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249970381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124985160 + 124985161.

It is an arithmetic number, because the mean of its divisors is an integer number (124985161).

Almost surely, 2^249970321 is an apocalyptic number.

It is an amenable number.

249970321 is a deficient number, since it is larger than the sum of its proper divisors (1).

249970321 is an equidigital number, since it uses as much as digits as its factorization.

249970321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 249970321 is about 15810.4497405988. The cubic root of 249970321 is about 629.9355951630.

It can be divided in two parts, 24 and 9970321, that added together give a triangular number (9970345 = T₄₄₆₅).

The spelling of 249970321 in words is "two hundred forty-nine million, nine hundred seventy thousand, three hundred twenty-one".