5191954638 has 16 divisors (see below), whose sum is σ = 11182671696. Its totient is φ = 1597524480.

The previous prime is 5191954637. The next prime is 5191954643. The reversal of 5191954638 is 8364591915.

It is a super-2 number, since 2×5191954638² = 53912785926099422088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5191954637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33281683 + ... + 33281838.

It is an arithmetic number, because the mean of its divisors is an integer number (698916981).

Almost surely, 2^5191954638 is an apocalyptic number.

5191954638 is an abundant number, since it is smaller than the sum of its proper divisors (5990717058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5191954638 is a wasteful number, since it uses less digits than its factorization.

5191954638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66563539.

The product of its digits is 1166400, while the sum is 51.

The square root of 5191954638 is about 72055.2193668162. The cubic root of 5191954638 is about 1731.5842613881.

The spelling of 5191954638 in words is "five billion, one hundred ninety-one million, nine hundred fifty-four thousand, six hundred thirty-eight".