3997196491401 has 9 divisors (see below), whose sum is σ = 5773736928999. Its totient is φ = 2664793662336.

The previous prime is 3997196491381. The next prime is 3997196491441. The reversal of 3997196491401 is 1041946917993.

The square root of 3997196491401 is 1999299.

It is a perfect power (a square), and thus also a powerful number.

3997196491401 is a `hidden beast` number, since 3 + 9 + 97 + 19 + 6 + 491 + 40 + 1 = 666.

3997196491401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1843417175625 + 2153779315776 = 1357725^2 + 1467576^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 3997196491401 - 2¹⁹ = 3997195967113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3997196491441) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5664681 + ... + 6331113.

Almost surely, 2^{3997196491401} is an apocalyptic number.

3997196491401 is the 1999299-th square number.

3997196491401 is the 999650-th centered octagonal number.

It is an amenable number.

3997196491401 is a deficient number, since it is larger than the sum of its proper divisors (1776540437598).

3997196491401 is an frugal number, since it uses more digits than its factorization.

3997196491401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332872 (or 666436 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 3997196491401 in words is "three trillion, nine hundred ninety-seven billion, one hundred ninety-six million, four hundred ninety-one thousand, four hundred one".