191957153 has 2 divisors, whose sum is σ = 191957154. Its totient is φ = 191957152.

The previous prime is 191957137. The next prime is 191957201. The reversal of 191957153 is 351759191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189667984 + 2289169 = 13772^2 + 1513^2 .

It is a cyclic number.

It is not a de Polignac number, because 191957153 - 2⁴ = 191957137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191957153.

It is not a weakly prime, because it can be changed into another prime (191957453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95978576 + 95978577.

It is an arithmetic number, because the mean of its divisors is an integer number (95978577).

Almost surely, 2^191957153 is an apocalyptic number.

It is an amenable number.

191957153 is a deficient number, since it is larger than the sum of its proper divisors (1).

191957153 is an equidigital number, since it uses as much as digits as its factorization.

191957153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42525, while the sum is 41.

The square root of 191957153 is about 13854.8602663470. The cubic root of 191957153 is about 576.8569109947.

The spelling of 191957153 in words is "one hundred ninety-one million, nine hundred fifty-seven thousand, one hundred fifty-three".