413947891921 has 4 divisors (see below), whose sum is σ = 413949321712. Its totient is φ = 413946462132.

The previous prime is 413947891919. The next prime is 413947891957. The reversal of 413947891921 is 129198749314.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 413947891921 - 2¹ = 413947891919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (413927891921) 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, 110031 + ... + 916516.

It is an arithmetic number, because the mean of its divisors is an integer number (103487330428).

Almost surely, 2^413947891921 is an apocalyptic number.

It is an amenable number.

413947891921 is a deficient number, since it is larger than the sum of its proper divisors (1429791).

413947891921 is a wasteful number, since it uses less digits than its factorization.

413947891921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429790.

The product of its digits is 3919104, while the sum is 58.

The spelling of 413947891921 in words is "four hundred thirteen billion, nine hundred forty-seven million, eight hundred ninety-one thousand, nine hundred twenty-one".