1581096169 has 9 divisors (see below), whose sum is σ = 1680291127. Its totient is φ = 1487454304.

The previous prime is 1581096151. The next prime is 1581096239. The reversal of 1581096169 is 9616901851.

It is a happy number.

The square root of 1581096169 is 39763.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1230957225 + 350138944 = 35085^2 + 18712^2 .

It is not a de Polignac number, because 1581096169 - 2⁵ = 1581096137 is a prime.

It is a super-2 number, since 2×1581096169² = 4999730191252953122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1581096109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 674802 + ... + 677140.

Almost surely, 2^1581096169 is an apocalyptic number.

1581096169 is the 39763-rd square number.

1581096169 is the 19882-nd centered octagonal number.

It is an amenable number.

1581096169 is a deficient number, since it is larger than the sum of its proper divisors (99194958).

1581096169 is an frugal number, since it uses more digits than its factorization.

1581096169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712 (or 2356 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 46.

The cubic root of 1581096169 is about 1164.9825730046.

The spelling of 1581096169 in words is "one billion, five hundred eighty-one million, ninety-six thousand, one hundred sixty-nine".