123887569 has 4 divisors (see below), whose sum is σ = 133417396. Its totient is φ = 114357744.

The previous prime is 123887567. The next prime is 123887573. The reversal of 123887569 is 965788321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25877569 + 98010000 = 5087^2 + 9900^2 .

It is a cyclic number.

It is not a de Polignac number, because 123887569 - 2¹ = 123887567 is a prime.

It is a super-2 number, since 2×123887569² = 30696259505459522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123887567) 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, 4764894 + ... + 4764919.

It is an arithmetic number, because the mean of its divisors is an integer number (33354349).

Almost surely, 2^123887569 is an apocalyptic number.

It is an amenable number.

123887569 is a deficient number, since it is larger than the sum of its proper divisors (9529827).

123887569 is an equidigital number, since it uses as much as digits as its factorization.

123887569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9529826.

The product of its digits is 725760, while the sum is 49.

The square root of 123887569 is about 11130.4792798873. The cubic root of 123887569 is about 498.5123367728.

The spelling of 123887569 in words is "one hundred twenty-three million, eight hundred eighty-seven thousand, five hundred sixty-nine".