249387949997 has 2 divisors, whose sum is σ = 249387949998. Its totient is φ = 249387949996.

The previous prime is 249387949991. The next prime is 249387950029. The reversal of 249387949997 is 799949783942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202199511556 + 47188438441 = 449666^2 + 217229^2 .

It is a cyclic number.

It is not a de Polignac number, because 249387949997 - 2¹⁰ = 249387948973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249387949991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124693974998 + 124693974999.

It is an arithmetic number, because the mean of its divisors is an integer number (124693974999).

Almost surely, 2^249387949997 is an apocalyptic number.

It is an amenable number.

249387949997 is a deficient number, since it is larger than the sum of its proper divisors (1).

249387949997 is an equidigital number, since it uses as much as digits as its factorization.

249387949997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222131968, while the sum is 80.

The spelling of 249387949997 in words is "two hundred forty-nine billion, three hundred eighty-seven million, nine hundred forty-nine thousand, nine hundred ninety-seven".