191248507 has 2 divisors, whose sum is σ = 191248508. Its totient is φ = 191248506.

The previous prime is 191248489. The next prime is 191248513. The reversal of 191248507 is 705842191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191248507 - 2¹¹ = 191246459 is a prime.

It is not a weakly prime, because it can be changed into another prime (191248537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95624253 + 95624254.

It is an arithmetic number, because the mean of its divisors is an integer number (95624254).

Almost surely, 2^191248507 is an apocalyptic number.

191248507 is a deficient number, since it is larger than the sum of its proper divisors (1).

191248507 is an equidigital number, since it uses as much as digits as its factorization.

191248507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 191248507 is about 13829.2627063051. The cubic root of 191248507 is about 576.1461770125.

The spelling of 191248507 in words is "one hundred ninety-one million, two hundred forty-eight thousand, five hundred seven".