191212513 has 2 divisors, whose sum is σ = 191212514. Its totient is φ = 191212512.

The previous prime is 191212453. The next prime is 191212519. The reversal of 191212513 is 315212191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185586129 + 5626384 = 13623^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 191212513 - 2⁹ = 191212001 is a prime.

It is not a weakly prime, because it can be changed into another prime (191212519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95606256 + 95606257.

It is an arithmetic number, because the mean of its divisors is an integer number (95606257).

Almost surely, 2^191212513 is an apocalyptic number.

It is an amenable number.

191212513 is a deficient number, since it is larger than the sum of its proper divisors (1).

191212513 is an equidigital number, since it uses as much as digits as its factorization.

191212513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 25.

The square root of 191212513 is about 13827.9612741720. The cubic root of 191212513 is about 576.1100301392.

The spelling of 191212513 in words is "one hundred ninety-one million, two hundred twelve thousand, five hundred thirteen".