1245878091 has 20 divisors (see below), whose sum is σ = 1891644304. Its totient is φ = 816966000.

The previous prime is 1245878063. The next prime is 1245878093. The reversal of 1245878091 is 1908785421.

It is not a de Polignac number, because 1245878091 - 2¹⁰ = 1245877067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245878093) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 121135 + ... + 131016.

Almost surely, 2^1245878091 is an apocalyptic number.

1245878091 is a deficient number, since it is larger than the sum of its proper divisors (645766213).

1245878091 is an equidigital number, since it uses as much as digits as its factorization.

1245878091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252224 (or 252215 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 1245878091 is about 35296.9983284698. The cubic root of 1245878091 is about 1076.0319899810.

The spelling of 1245878091 in words is "one billion, two hundred forty-five million, eight hundred seventy-eight thousand, ninety-one".