1641261311 has 8 divisors (see below), whose sum is σ = 1739004624. Its totient is φ = 1543651200.

The previous prime is 1641261289. The next prime is 1641261313. The reversal of 1641261311 is 1131621461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1641261311 - 2²² = 1637067007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641261313) 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 7 ways as a sum of consecutive naturals, for example, 7340 + ... + 57761.

It is an arithmetic number, because the mean of its divisors is an integer number (217375578).

Almost surely, 2^1641261311 is an apocalyptic number.

1641261311 is a deficient number, since it is larger than the sum of its proper divisors (97743313).

1641261311 is a wasteful number, since it uses less digits than its factorization.

1641261311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66601.

The product of its digits is 864, while the sum is 26.

The square root of 1641261311 is about 40512.4833970963. The cubic root of 1641261311 is about 1179.5759538760.

Adding to 1641261311 its reverse (1131621461), we get a palindrome (2772882772).

The spelling of 1641261311 in words is "one billion, six hundred forty-one million, two hundred sixty-one thousand, three hundred eleven".