191400247 has 2 divisors, whose sum is σ = 191400248. Its totient is φ = 191400246.

The previous prime is 191400221. The next prime is 191400269. The reversal of 191400247 is 742004191.

191400247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191400247 is a prime.

It is a super-2 number, since 2×191400247² = 73268109103322018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191400217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95700123 + 95700124.

It is an arithmetic number, because the mean of its divisors is an integer number (95700124).

Almost surely, 2^191400247 is an apocalyptic number.

191400247 is a deficient number, since it is larger than the sum of its proper divisors (1).

191400247 is an equidigital number, since it uses as much as digits as its factorization.

191400247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 191400247 is about 13834.7478112180. The cubic root of 191400247 is about 576.2985116391.

The spelling of 191400247 in words is "one hundred ninety-one million, four hundred thousand, two hundred forty-seven".