814635139 has 2 divisors, whose sum is σ = 814635140. Its totient is φ = 814635138.

The previous prime is 814635119. The next prime is 814635149. The reversal of 814635139 is 931536418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 814635139 - 2⁷ = 814635011 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (814635119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407317569 + 407317570.

It is an arithmetic number, because the mean of its divisors is an integer number (407317570).

Almost surely, 2^814635139 is an apocalyptic number.

814635139 is a deficient number, since it is larger than the sum of its proper divisors (1).

814635139 is an equidigital number, since it uses as much as digits as its factorization.

814635139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 814635139 is about 28541.8138701800. The cubic root of 814635139 is about 933.9444517125.

The spelling of 814635139 in words is "eight hundred fourteen million, six hundred thirty-five thousand, one hundred thirty-nine".