1531969 has 4 divisors (see below), whose sum is σ = 1534896. Its totient is φ = 1529044.

The previous prime is 1531909. The next prime is 1531987. The reversal of 1531969 is 9691351.

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 1531969 - 2¹⁹ = 1007681 is a prime.

It is a super-2 number, since 2×1531969² = 4693858033922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1531909) 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, 439 + ... + 1804.

It is an arithmetic number, because the mean of its divisors is an integer number (383724).

2^1531969 is an apocalyptic number.

It is an amenable number.

1531969 is a deficient number, since it is larger than the sum of its proper divisors (2927).

1531969 is an equidigital number, since it uses as much as digits as its factorization.

1531969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926.

The product of its digits is 7290, while the sum is 34.

The square root of 1531969 is about 1237.7273528528. The cubic root of 1531969 is about 115.2789447708.

It can be divided in two parts, 1531 and 969, that added together give a square (2500 = 50²).

The spelling of 1531969 in words is "one million, five hundred thirty-one thousand, nine hundred sixty-nine".