999122692501 has 4 divisors (see below), whose sum is σ = 999125191404. Its totient is φ = 999120193600.

The previous prime is 999122692489. The next prime is 999122692543. The reversal of 999122692501 is 105296221999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105296221999 = 19 ⋅5541906421.

It can be written as a sum of positive squares in 2 ways, for example, as 585223470001 + 413899222500 = 764999^2 + 643350^2 .

It is a 3-Lehmer number, since φ(999122692501) divides (999122692501-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999122692501 is a prime.

It is a deceptive number, since it divides R_999122692500.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999122692201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499780 + ... + 1499341.

It is an arithmetic number, because the mean of its divisors is an integer number (249781297851).

Almost surely, 2^999122692501 is an apocalyptic number.

999122692501 is the 499781-st decagonal number.

It is an amenable number.

999122692501 is a deficient number, since it is larger than the sum of its proper divisors (2498903).

999122692501 is a wasteful number, since it uses less digits than its factorization.

999122692501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498902.

The product of its (nonzero) digits is 1574640, while the sum is 55.

The spelling of 999122692501 in words is "nine hundred ninety-nine billion, one hundred twenty-two million, six hundred ninety-two thousand, five hundred one".