245500991 has 2 divisors, whose sum is σ = 245500992. Its totient is φ = 245500990.

The previous prime is 245500987. The next prime is 245501017. The reversal of 245500991 is 199005542.

245500991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245500991 - 2² = 245500987 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245500901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122750495 + 122750496.

It is an arithmetic number, because the mean of its divisors is an integer number (122750496).

Almost surely, 2^245500991 is an apocalyptic number.

245500991 is a deficient number, since it is larger than the sum of its proper divisors (1).

245500991 is an equidigital number, since it uses as much as digits as its factorization.

245500991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 245500991 is about 15668.4712400413. The cubic root of 245500991 is about 626.1586962028.

The spelling of 245500991 in words is "two hundred forty-five million, five hundred thousand, nine hundred ninety-one".