999157669 has 4 divisors (see below), whose sum is σ = 1000604320. Its totient is φ = 997711020.

The previous prime is 999157637. The next prime is 999157673. The reversal of 999157669 is 966751999.

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.

It is a cyclic number.

It is not a de Polignac number, because 999157669 - 2⁵ = 999157637 is a prime.

It is a super-2 number, since 2×999157669² = 1996632095043027122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999157069) 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, 722289 + ... + 723670.

It is an arithmetic number, because the mean of its divisors is an integer number (250151080).

Almost surely, 2^999157669 is an apocalyptic number.

It is an amenable number.

999157669 is a deficient number, since it is larger than the sum of its proper divisors (1446651).

999157669 is a wasteful number, since it uses less digits than its factorization.

999157669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446650.

The product of its digits is 8266860, while the sum is 61.

The square root of 999157669 is about 31609.4553733531. The cubic root of 999157669 is about 999.7191441274.

It can be divided in two parts, 99915 and 7669, that added together give a square (107584 = 328²).

The spelling of 999157669 in words is "nine hundred ninety-nine million, one hundred fifty-seven thousand, six hundred sixty-nine".