1521889 has 6 divisors (see below), whose sum is σ = 1551030. Its totient is φ = 1493280.

The previous prime is 1521869. The next prime is 1521893. The reversal of 1521889 is 9881251.

It can be written as a sum of positive squares in 3 ways, for example, as 1600 + 1520289 = 40^2 + 1233^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1521889 is a prime.

It is a super-2 number, since 2×1521889² = 4632292256642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3517 + ... + 3925.

It is an arithmetic number, because the mean of its divisors is an integer number (258505).

2^1521889 is an apocalyptic number.

It is an amenable number.

1521889 is a deficient number, since it is larger than the sum of its proper divisors (29141).

1521889 is an frugal number, since it uses more digits than its factorization.

1521889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 470 counting only the distinct ones).

The product of its digits is 5760, while the sum is 34.

The square root of 1521889 is about 1233.6486533856. The cubic root of 1521889 is about 115.0255519781.

It can be divided in two parts, 15 and 21889, that added together give a square (21904 = 148²).

The spelling of 1521889 in words is "one million, five hundred twenty-one thousand, eight hundred eighty-nine".