245406991 has 2 divisors, whose sum is σ = 245406992. Its totient is φ = 245406990.

The previous prime is 245406979. The next prime is 245407007. The reversal of 245406991 is 199604542.

245406991 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 245406991 - 2⁹ = 245406479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245406911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122703495 + 122703496.

It is an arithmetic number, because the mean of its divisors is an integer number (122703496).

Almost surely, 2^245406991 is an apocalyptic number.

245406991 is a deficient number, since it is larger than the sum of its proper divisors (1).

245406991 is an equidigital number, since it uses as much as digits as its factorization.

245406991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 245406991 is about 15665.4712983683. The cubic root of 245406991 is about 626.0787692597.

The spelling of 245406991 in words is "two hundred forty-five million, four hundred six thousand, nine hundred ninety-one".