4015621491 has 24 divisors (see below), whose sum is σ = 6255095184. Its totient is φ = 2284773120.

The previous prime is 4015621453. The next prime is 4015621573. The reversal of 4015621491 is 1941265104.

It is not a de Polignac number, because 4015621491 - 2¹⁴ = 4015605107 is a prime.

It is a super-2 number, since 2×4015621491² = 32250431917962126162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4015620491) 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 23 ways as a sum of consecutive naturals, for example, 24370 + ... + 92871.

It is an arithmetic number, because the mean of its divisors is an integer number (260628966).

Almost surely, 2^4015621491 is an apocalyptic number.

4015621491 is a deficient number, since it is larger than the sum of its proper divisors (2239473693).

4015621491 is a wasteful number, since it uses less digits than its factorization.

4015621491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117491 (or 117484 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 4015621491 is about 63368.9315911196. The cubic root of 4015621491 is about 1589.4648319558.

Adding to 4015621491 its reverse (1941265104), we get a palindrome (5956886595).

The spelling of 4015621491 in words is "four billion, fifteen million, six hundred twenty-one thousand, four hundred ninety-one".