9138581942 has 16 divisors (see below), whose sum is σ = 15880746912. Its totient is φ = 3862883520.

The previous prime is 9138581941. The next prime is 9138581953. The reversal of 9138581942 is 2491858319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138581941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4469909 + ... + 4471952.

It is an arithmetic number, because the mean of its divisors is an integer number (992546682).

Almost surely, 2^9138581942 is an apocalyptic number.

9138581942 is a deficient number, since it is larger than the sum of its proper divisors (6742164970).

9138581942 is a wasteful number, since it uses less digits than its factorization.

9138581942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8941943.

The product of its digits is 622080, while the sum is 50.

The square root of 9138581942 is about 95595.9305723837. The cubic root of 9138581942 is about 2090.7058612580.

The spelling of 9138581942 in words is "nine billion, one hundred thirty-eight million, five hundred eighty-one thousand, nine hundred forty-two".