8913391642 has 4 divisors (see below), whose sum is σ = 13370087466. Its totient is φ = 4456695820.

The previous prime is 8913391637. The next prime is 8913391673. The reversal of 8913391642 is 2461933198.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2461933198 = 2 ⋅1230966599.

It can be written as a sum of positive squares in only one way, i.e., 8894564721 + 18826921 = 94311^2 + 4339^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8913391592 and 8913391601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2228347909 + ... + 2228347912.

Almost surely, 2^8913391642 is an apocalyptic number.

8913391642 is a deficient number, since it is larger than the sum of its proper divisors (4456695824).

8913391642 is a wasteful number, since it uses less digits than its factorization.

8913391642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456695823.

The product of its digits is 279936, while the sum is 46.

The square root of 8913391642 is about 94410.7602024261. The cubic root of 8913391642 is about 2073.3899848103.

The spelling of 8913391642 in words is "eight billion, nine hundred thirteen million, three hundred ninety-one thousand, six hundred forty-two".