249278140693 has 2 divisors, whose sum is σ = 249278140694. Its totient is φ = 249278140692.

The previous prime is 249278140681. The next prime is 249278140711. The reversal of 249278140693 is 396041872942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210564430129 + 38713710564 = 458873^2 + 196758^2 .

It is a cyclic number.

It is not a de Polignac number, because 249278140693 - 2¹³ = 249278132501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249278140613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124639070346 + 124639070347.

It is an arithmetic number, because the mean of its divisors is an integer number (124639070347).

Almost surely, 2^249278140693 is an apocalyptic number.

It is an amenable number.

249278140693 is a deficient number, since it is larger than the sum of its proper divisors (1).

249278140693 is an equidigital number, since it uses as much as digits as its factorization.

249278140693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 249278140693 in words is "two hundred forty-nine billion, two hundred seventy-eight million, one hundred forty thousand, six hundred ninety-three".