999408994273541 has 4 divisors (see below), whose sum is σ = 999409067281632. Its totient is φ = 999408921265452.

The previous prime is 999408994273537. The next prime is 999408994273583. The reversal of 999408994273541 is 145372499804999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 999408994273541 - 2² = 999408994273537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999408994273541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999408994273241) 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, 9126011 + ... + 45630056.

It is an arithmetic number, because the mean of its divisors is an integer number (249852266820408).

It is a Poulet number, since it divides 2^{999408994273540}-1.

Almost surely, 2^{999408994273541} is an apocalyptic number.

999408994273541 is the 18252023-rd octagonal number.

It is an amenable number.

999408994273541 is a deficient number, since it is larger than the sum of its proper divisors (73008091).

999408994273541 is a wasteful number, since it uses less digits than its factorization.

999408994273541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73008090.

The product of its (nonzero) digits is 6348948480, while the sum is 83.

The spelling of 999408994273541 in words is "nine hundred ninety-nine trillion, four hundred eight billion, nine hundred ninety-four million, two hundred seventy-three thousand, five hundred forty-one".