245193691 has 2 divisors, whose sum is σ = 245193692. Its totient is φ = 245193690.

The previous prime is 245193679. The next prime is 245193719. The reversal of 245193691 is 196391542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245193691 - 2⁷ = 245193563 is a prime.

It is a super-2 number, since 2×245193691² = 120239892212406962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (245193661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122596845 + 122596846.

It is an arithmetic number, because the mean of its divisors is an integer number (122596846).

Almost surely, 2^245193691 is an apocalyptic number.

245193691 is a deficient number, since it is larger than the sum of its proper divisors (1).

245193691 is an equidigital number, since it uses as much as digits as its factorization.

245193691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 245193691 is about 15658.6618521507. The cubic root of 245193691 is about 625.8973273891.

The spelling of 245193691 in words is "two hundred forty-five million, one hundred ninety-three thousand, six hundred ninety-one".