249867421 has 2 divisors, whose sum is σ = 249867422. Its totient is φ = 249867420.

The previous prime is 249867341. The next prime is 249867437. The reversal of 249867421 is 124768942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134304921 + 115562500 = 11589^2 + 10750^2 .

It is a cyclic number.

It is not a de Polignac number, because 249867421 - 2²³ = 241478813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249867481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124933710 + 124933711.

It is an arithmetic number, because the mean of its divisors is an integer number (124933711).

Almost surely, 2^249867421 is an apocalyptic number.

It is an amenable number.

249867421 is a deficient number, since it is larger than the sum of its proper divisors (1).

249867421 is an equidigital number, since it uses as much as digits as its factorization.

249867421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 249867421 is about 15807.1952287558. The cubic root of 249867421 is about 629.8491458745.

The spelling of 249867421 in words is "two hundred forty-nine million, eight hundred sixty-seven thousand, four hundred twenty-one".