249973639 has 2 divisors, whose sum is σ = 249973640. Its totient is φ = 249973638.

The previous prime is 249973621. The next prime is 249973643. The reversal of 249973639 is 936379942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249973639 - 2⁷ = 249973511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249973699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124986819 + 124986820.

It is an arithmetic number, because the mean of its divisors is an integer number (124986820).

Almost surely, 2^249973639 is an apocalyptic number.

249973639 is a deficient number, since it is larger than the sum of its proper divisors (1).

249973639 is an equidigital number, since it uses as much as digits as its factorization.

249973639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 52.

The square root of 249973639 is about 15810.5546708520. The cubic root of 249973639 is about 629.9383823166.

The spelling of 249973639 in words is "two hundred forty-nine million, nine hundred seventy-three thousand, six hundred thirty-nine".