3961421371 has 4 divisors (see below), whose sum is σ = 3961547392. Its totient is φ = 3961295352.

The previous prime is 3961421351. The next prime is 3961421377. The reversal of 3961421371 is 1731241693.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3961421371 - 2⁵ = 3961421339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3961421371.

It is not an unprimeable number, because it can be changed into a prime (3961421377) 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, 27046 + ... + 93028.

It is an arithmetic number, because the mean of its divisors is an integer number (990386848).

Almost surely, 2^3961421371 is an apocalyptic number.

3961421371 is a deficient number, since it is larger than the sum of its proper divisors (126021).

3961421371 is an equidigital number, since it uses as much as digits as its factorization.

3961421371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126020.

The product of its digits is 27216, while the sum is 37.

The square root of 3961421371 is about 62939.8234109375. The cubic root of 3961421371 is about 1582.2812439004.

The spelling of 3961421371 in words is "three billion, nine hundred sixty-one million, four hundred twenty-one thousand, three hundred seventy-one".