1921001291 has 8 divisors (see below), whose sum is σ = 2100189168. Its totient is φ = 1742572000.

The previous prime is 1921001279. The next prime is 1921001293.

1921001291 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921001291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1921001291.

It is not an unprimeable number, because it can be changed into a prime (1921001293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184340 + ... + 194481.

It is an arithmetic number, because the mean of its divisors is an integer number (262523646).

Almost surely, 2^1921001291 is an apocalyptic number.

1921001291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1921001291 is a deficient number, since it is larger than the sum of its proper divisors (179187877).

1921001291 is a wasteful number, since it uses less digits than its factorization.

1921001291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379293.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1921001291 is about 43829.2287292396. The cubic root of 1921001291 is about 1243.1090234410.

It can be divided in two parts, 192100 and 1291, that added together give a palindrome (193391).

The spelling of 1921001291 in words is "one billion, nine hundred twenty-one million, one thousand, two hundred ninety-one".