245690191 has 2 divisors, whose sum is σ = 245690192. Its totient is φ = 245690190.

The previous prime is 245690189. The next prime is 245690213. The reversal of 245690191 is 191096542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245690191 - 2¹ = 245690189 is a prime.

Together with 245690189, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 245690191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245690131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122845095 + 122845096.

It is an arithmetic number, because the mean of its divisors is an integer number (122845096).

Almost surely, 2^245690191 is an apocalyptic number.

245690191 is a deficient number, since it is larger than the sum of its proper divisors (1).

245690191 is an equidigital number, since it uses as much as digits as its factorization.

245690191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 245690191 is about 15674.5076796689. The cubic root of 245690191 is about 626.3195085949.

The spelling of 245690191 in words is "two hundred forty-five million, six hundred ninety thousand, one hundred ninety-one".