1641071291 has 4 divisors (see below), whose sum is σ = 1641802584. Its totient is φ = 1640340000.

The previous prime is 1641071281. The next prime is 1641071309. The reversal of 1641071291 is 1921701461.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1641071291 - 2¹⁰ = 1641070267 is a prime.

It is a super-2 number, since 2×1641071291² = 5386229964288813362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641071281) 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, 362270 + ... + 366771.

It is an arithmetic number, because the mean of its divisors is an integer number (410450646).

Almost surely, 2^1641071291 is an apocalyptic number.

1641071291 is a deficient number, since it is larger than the sum of its proper divisors (731293).

1641071291 is an equidigital number, since it uses as much as digits as its factorization.

1641071291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731292.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1641071291 is about 40510.1381261531. The cubic root of 1641071291 is about 1179.5304296051.

The spelling of 1641071291 in words is "one billion, six hundred forty-one million, seventy-one thousand, two hundred ninety-one".