249892021 has 2 divisors, whose sum is σ = 249892022. Its totient is φ = 249892020.

The previous prime is 249892003. The next prime is 249892031. The reversal of 249892021 is 120298942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162843121 + 87048900 = 12761^2 + 9330^2 .

It is a cyclic number.

It is not a de Polignac number, because 249892021 - 2⁷ = 249891893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249892031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124946010 + 124946011.

It is an arithmetic number, because the mean of its divisors is an integer number (124946011).

Almost surely, 2^249892021 is an apocalyptic number.

It is an amenable number.

249892021 is a deficient number, since it is larger than the sum of its proper divisors (1).

249892021 is an equidigital number, since it uses as much as digits as its factorization.

249892021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 249892021 is about 15807.9733362629. The cubic root of 249892021 is about 629.8698152098.

The spelling of 249892021 in words is "two hundred forty-nine million, eight hundred ninety-two thousand, twenty-one".