3997132841491 has 4 divisors (see below), whose sum is σ = 3997156555800. Its totient is φ = 3997109127184.

The previous prime is 3997132841483. The next prime is 3997132841503. The reversal of 3997132841491 is 1941482317993.

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 3997132841491 - 2³ = 3997132841483 is a prime.

It is a super-2 number, since 2×3997132841491² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3997132841411) 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, 11602501 + ... + 11942038.

It is an arithmetic number, because the mean of its divisors is an integer number (999289138950).

Almost surely, 2^{3997132841491} is an apocalyptic number.

3997132841491 is a deficient number, since it is larger than the sum of its proper divisors (23714309).

3997132841491 is a wasteful number, since it uses less digits than its factorization.

3997132841491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23714308.

The product of its digits is 11757312, while the sum is 61.

The spelling of 3997132841491 in words is "three trillion, nine hundred ninety-seven billion, one hundred thirty-two million, eight hundred forty-one thousand, four hundred ninety-one".