1222142991 has 16 divisors (see below), whose sum is σ = 1663226880. Its totient is φ = 798023520.

The previous prime is 1222142983. The next prime is 1222142993. The reversal of 1222142991 is 1992412221.

It is not a de Polignac number, because 1222142991 - 2³ = 1222142983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222142993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29766 + ... + 57708.

It is an arithmetic number, because the mean of its divisors is an integer number (103951680).

Almost surely, 2^1222142991 is an apocalyptic number.

1222142991 is a deficient number, since it is larger than the sum of its proper divisors (441083889).

1222142991 is a wasteful number, since it uses less digits than its factorization.

1222142991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28246.

The product of its digits is 5184, while the sum is 33.

The square root of 1222142991 is about 34959.1617605457. The cubic root of 1222142991 is about 1069.1550061480.

The spelling of 1222142991 in words is "one billion, two hundred twenty-two million, one hundred forty-two thousand, nine hundred ninety-one".