101538191 has 2 divisors, whose sum is σ = 101538192. Its totient is φ = 101538190.

The previous prime is 101538163. The next prime is 101538197. The reversal of 101538191 is 191835101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101538191 - 2¹⁸ = 101276047 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101538197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50769095 + 50769096.

It is an arithmetic number, because the mean of its divisors is an integer number (50769096).

Almost surely, 2^101538191 is an apocalyptic number.

101538191 is a deficient number, since it is larger than the sum of its proper divisors (1).

101538191 is an equidigital number, since it uses as much as digits as its factorization.

101538191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 29.

The square root of 101538191 is about 10076.6160490514. The cubic root of 101538191 is about 466.5266675852.

The spelling of 101538191 in words is "one hundred one million, five hundred thirty-eight thousand, one hundred ninety-one".