1245984851 has 4 divisors (see below), whose sum is σ = 1247644704. Its totient is φ = 1244325000.

The previous prime is 1245984827. The next prime is 1245984853. The reversal of 1245984851 is 1584895421.

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 1245984851 - 2²² = 1241790547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1245984796 and 1245984805.

It is not an unprimeable number, because it can be changed into a prime (1245984853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828800 + ... + 830301.

It is an arithmetic number, because the mean of its divisors is an integer number (311911176).

Almost surely, 2^1245984851 is an apocalyptic number.

1245984851 is a deficient number, since it is larger than the sum of its proper divisors (1659853).

1245984851 is an equidigital number, since it uses as much as digits as its factorization.

1245984851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659852.

The product of its digits is 460800, while the sum is 47.

The square root of 1245984851 is about 35298.5106059732. The cubic root of 1245984851 is about 1076.0627243669.

The spelling of 1245984851 in words is "one billion, two hundred forty-five million, nine hundred eighty-four thousand, eight hundred fifty-one".