2461991921 has 6 divisors (see below), whose sum is σ = 2573689650. Its totient is φ = 2354948288.

The previous prime is 2461991887. The next prime is 2461992019. The reversal of 2461991921 is 1291991642.

It can be written as a sum of positive squares in only one way, i.e., 2063430625 + 398561296 = 45425^2 + 19964^2 .

It is not a de Polignac number, because 2461991921 - 2¹⁰ = 2461990897 is a prime.

It is a super-2 number, since 2×2461991921² = 12122808438138540482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2461993921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2326496 + ... + 2327553.

It is an arithmetic number, because the mean of its divisors is an integer number (428948275).

Almost surely, 2^2461991921 is an apocalyptic number.

It is an amenable number.

2461991921 is a deficient number, since it is larger than the sum of its proper divisors (111697729).

2461991921 is an equidigital number, since it uses as much as digits as its factorization.

2461991921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4654095 (or 4654072 counting only the distinct ones).

The product of its digits is 69984, while the sum is 44.

The square root of 2461991921 is about 49618.4635090608. The cubic root of 2461991921 is about 1350.2956683903.

The spelling of 2461991921 in words is "two billion, four hundred sixty-one million, nine hundred ninety-one thousand, nine hundred twenty-one".