2138975477 has 2 divisors, whose sum is σ = 2138975478. Its totient is φ = 2138975476.

The previous prime is 2138975437. The next prime is 2138975519. The reversal of 2138975477 is 7745798312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2138970001 + 5476 = 46249^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138975477 - 2⁸ = 2138975221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138975437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069487738 + 1069487739.

It is an arithmetic number, because the mean of its divisors is an integer number (1069487739).

Almost surely, 2^2138975477 is an apocalyptic number.

It is an amenable number.

2138975477 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138975477 is an equidigital number, since it uses as much as digits as its factorization.

2138975477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 53.

The square root of 2138975477 is about 46249.0592012421. The cubic root of 2138975477 is about 1288.4530616592.

The spelling of 2138975477 in words is "two billion, one hundred thirty-eight million, nine hundred seventy-five thousand, four hundred seventy-seven".