1285792891 has 4 divisors (see below), whose sum is σ = 1286500032. Its totient is φ = 1285085752.

The previous prime is 1285792829. The next prime is 1285792901. The reversal of 1285792891 is 1982975821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1982975821 = 9157 ⋅216553.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285792891 is a prime.

It is a super-2 number, since 2×1285792891² = 3306526717092275762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285792811) 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, 350836 + ... + 354481.

It is an arithmetic number, because the mean of its divisors is an integer number (321625008).

Almost surely, 2^1285792891 is an apocalyptic number.

1285792891 is a deficient number, since it is larger than the sum of its proper divisors (707141).

1285792891 is an equidigital number, since it uses as much as digits as its factorization.

1285792891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707140.

The product of its digits is 725760, while the sum is 52.

The square root of 1285792891 is about 35857.9543616197. The cubic root of 1285792891 is about 1087.4025324370.

The spelling of 1285792891 in words is "one billion, two hundred eighty-five million, seven hundred ninety-two thousand, eight hundred ninety-one".