2138975497 has 4 divisors (see below), whose sum is σ = 2147851156. Its totient is φ = 2130099840.

The previous prime is 2138975477. The next prime is 2138975519. The reversal of 2138975497 is 7945798312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1651934736 + 487040761 = 40644^2 + 22069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138975497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138975437) 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 3 ways as a sum of consecutive naturals, for example, 4437468 + ... + 4437949.

It is an arithmetic number, because the mean of its divisors is an integer number (536962789).

Almost surely, 2^2138975497 is an apocalyptic number.

It is an amenable number.

2138975497 is a deficient number, since it is larger than the sum of its proper divisors (8875659).

2138975497 is an equidigital number, since it uses as much as digits as its factorization.

2138975497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8875658.

The product of its digits is 3810240, while the sum is 55.

The square root of 2138975497 is about 46249.0594174628. The cubic root of 2138975497 is about 1288.4530656750.

The spelling of 2138975497 in words is "two billion, one hundred thirty-eight million, nine hundred seventy-five thousand, four hundred ninety-seven".