245371861 has 6 divisors (see below), whose sum is σ = 285432630. Its totient is φ = 210318696.

The previous prime is 245371837. The next prime is 245371877. The reversal of 245371861 is 168173542.

It can be written as a sum of positive squares in only one way, i.e., 130667761 + 114704100 = 11431^2 + 10710^2 .

It is not a de Polignac number, because 245371861 - 2¹⁹ = 244847573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245371861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245371831) 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 5 ways as a sum of consecutive naturals, for example, 2503746 + ... + 2503843.

It is an arithmetic number, because the mean of its divisors is an integer number (47572105).

Almost surely, 2^245371861 is an apocalyptic number.

It is an amenable number.

245371861 is a deficient number, since it is larger than the sum of its proper divisors (40060769).

245371861 is an equidigital number, since it uses as much as digits as its factorization.

245371861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5007603 (or 5007596 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 245371861 is about 15664.3500024738. The cubic root of 245371861 is about 626.0488934513.

The spelling of 245371861 in words is "two hundred forty-five million, three hundred seventy-one thousand, eight hundred sixty-one".