20153191 has 2 divisors, whose sum is σ = 20153192. Its totient is φ = 20153190.

The previous prime is 20153153. The next prime is 20153201. The reversal of 20153191 is 19135102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20153191 - 2²³ = 11764583 is a prime.

It is a super-2 number, since 2×20153191² = 812302214964962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20153101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10076595 + 10076596.

It is an arithmetic number, because the mean of its divisors is an integer number (10076596).

Almost surely, 2^20153191 is an apocalyptic number.

20153191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20153191 is an equidigital number, since it uses as much as digits as its factorization.

20153191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 20153191 is about 4489.2305576791. The cubic root of 20153191 is about 272.1330402730.

Adding to 20153191 its reverse (19135102), we get a palindrome (39288293).

The spelling of 20153191 in words is "twenty million, one hundred fifty-three thousand, one hundred ninety-one".