913649489891 has 4 divisors (see below), whose sum is σ = 922519873392. Its totient is φ = 904779106392.

The previous prime is 913649489887. The next prime is 913649489927. The reversal of 913649489891 is 198984946319.

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 913649489891 - 2² = 913649489887 is a prime.

It is a super-2 number, since 2×913649489891² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (913649489801) 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, 4435191596 + ... + 4435191801.

It is an arithmetic number, because the mean of its divisors is an integer number (230629968348).

Almost surely, 2^913649489891 is an apocalyptic number.

913649489891 is a deficient number, since it is larger than the sum of its proper divisors (8870383501).

913649489891 is a wasteful number, since it uses less digits than its factorization.

913649489891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870383500.

The product of its digits is 120932352, while the sum is 71.

The spelling of 913649489891 in words is "nine hundred thirteen billion, six hundred forty-nine million, four hundred eighty-nine thousand, eight hundred ninety-one".