245121091 has 4 divisors (see below), whose sum is σ = 245197384. Its totient is φ = 245044800.

The previous prime is 245121089. The next prime is 245121101. The reversal of 245121091 is 190121542.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245121091 - 2¹ = 245121089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245121031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33105 + ... + 39826.

It is an arithmetic number, because the mean of its divisors is an integer number (61299346).

Almost surely, 2^245121091 is an apocalyptic number.

245121091 is a deficient number, since it is larger than the sum of its proper divisors (76293).

245121091 is an equidigital number, since it uses as much as digits as its factorization.

245121091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76292.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 245121091 is about 15656.3434747709. The cubic root of 245121091 is about 625.8355468007.

The spelling of 245121091 in words is "two hundred forty-five million, one hundred twenty-one thousand, ninety-one".