1641291669 has 12 divisors (see below), whose sum is σ = 2373002892. Its totient is φ = 1093156800.

The previous prime is 1641291667. The next prime is 1641291671. The reversal of 1641291669 is 9661921461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1641291667) and next prime (1641291671).

It can be written as a sum of positive squares in 2 ways, for example, as 1151244900 + 490046769 = 33930^2 + 22137^2 .

It is not a de Polignac number, because 1641291669 - 2¹ = 1641291667 is a prime.

It is a super-2 number, since 2×1641291669² = 5387676685457611122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641291667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76392 + ... + 95489.

It is an arithmetic number, because the mean of its divisors is an integer number (197750241).

Almost surely, 2^1641291669 is an apocalyptic number.

It is an amenable number.

1641291669 is a deficient number, since it is larger than the sum of its proper divisors (731711223).

1641291669 is a wasteful number, since it uses less digits than its factorization.

1641291669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172948 (or 172945 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 1641291669 is about 40512.8580700004. The cubic root of 1641291669 is about 1179.5832266049.

The spelling of 1641291669 in words is "one billion, six hundred forty-one million, two hundred ninety-one thousand, six hundred sixty-nine".