999900002501 has 2 divisors, whose sum is σ = 999900002502. Its totient is φ = 999900002500.

The previous prime is 999900002449. The next prime is 999900002509. The reversal of 999900002501 is 105200009999.

It is a Cunningham number, because it is equal to 999950²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999900002500 + 1 = 999950^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 999900002501 - 2³⁸ = 725022095557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999900002509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499950001250 + 499950001251.

It is an arithmetic number, because the mean of its divisors is an integer number (499950001251).

Almost surely, 2^999900002501 is an apocalyptic number.

It is an amenable number.

999900002501 is a deficient number, since it is larger than the sum of its proper divisors (1).

999900002501 is an equidigital number, since it uses as much as digits as its factorization.

999900002501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 44.

The spelling of 999900002501 in words is "nine hundred ninety-nine billion, nine hundred million, two thousand, five hundred one".