249890299621 has 2 divisors, whose sum is σ = 249890299622. Its totient is φ = 249890299620.

The previous prime is 249890299601. The next prime is 249890299639. The reversal of 249890299621 is 126992098942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181722311521 + 68167988100 = 426289^2 + 261090^2 .

It is a cyclic number.

It is not a de Polignac number, because 249890299621 - 2²¹ = 249888202469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249890299621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249890299601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124945149810 + 124945149811.

It is an arithmetic number, because the mean of its divisors is an integer number (124945149811).

Almost surely, 2^249890299621 is an apocalyptic number.

It is an amenable number.

249890299621 is a deficient number, since it is larger than the sum of its proper divisors (1).

249890299621 is an equidigital number, since it uses as much as digits as its factorization.

249890299621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 249890299621 in words is "two hundred forty-nine billion, eight hundred ninety million, two hundred ninety-nine thousand, six hundred twenty-one".