245701891 has 4 divisors (see below), whose sum is σ = 254174400. Its totient is φ = 237229384.

The previous prime is 245701843. The next prime is 245701909. The reversal of 245701891 is 198107542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198107542 = 2 ⋅99053771.

It is a cyclic number.

It is not a de Polignac number, because 245701891 - 2²³ = 237313283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245701891.

It is not an unprimeable number, because it can be changed into a prime (245701811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4236211 + ... + 4236268.

It is an arithmetic number, because the mean of its divisors is an integer number (63543600).

Almost surely, 2^245701891 is an apocalyptic number.

245701891 is a deficient number, since it is larger than the sum of its proper divisors (8472509).

245701891 is an equidigital number, since it uses as much as digits as its factorization.

245701891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8472508.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 245701891 is about 15674.8808926894. The cubic root of 245701891 is about 626.3294504135.

The spelling of 245701891 in words is "two hundred forty-five million, seven hundred one thousand, eight hundred ninety-one".