191403497 has 2 divisors, whose sum is σ = 191403498. Its totient is φ = 191403496.

The previous prime is 191403481. The next prime is 191403521. The reversal of 191403497 is 794304191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188677696 + 2725801 = 13736^2 + 1651^2 .

It is a cyclic number.

It is not a de Polignac number, because 191403497 - 2⁴ = 191403481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191403497.

It is not a weakly prime, because it can be changed into another prime (191406497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95701748 + 95701749.

It is an arithmetic number, because the mean of its divisors is an integer number (95701749).

Almost surely, 2^191403497 is an apocalyptic number.

It is an amenable number.

191403497 is a deficient number, since it is larger than the sum of its proper divisors (1).

191403497 is an equidigital number, since it uses as much as digits as its factorization.

191403497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 191403497 is about 13834.8652685886. The cubic root of 191403497 is about 576.3017734941.

The spelling of 191403497 in words is "one hundred ninety-one million, four hundred three thousand, four hundred ninety-seven".