990250473139 has 2 divisors, whose sum is σ = 990250473140. Its totient is φ = 990250473138.

The previous prime is 990250473101. The next prime is 990250473143. The reversal of 990250473139 is 931374052099.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990250473139 is a prime.

It is not a weakly prime, because it can be changed into another prime (990250423139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495125236569 + 495125236570.

It is an arithmetic number, because the mean of its divisors is an integer number (495125236570).

Almost surely, 2^990250473139 is an apocalyptic number.

990250473139 is a deficient number, since it is larger than the sum of its proper divisors (1).

990250473139 is an equidigital number, since it uses as much as digits as its factorization.

990250473139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The spelling of 990250473139 in words is "nine hundred ninety billion, two hundred fifty million, four hundred seventy-three thousand, one hundred thirty-nine".