1131222001 has 16 divisors (see below), whose sum is σ = 1393337344. Its totient is φ = 894348864.

The previous prime is 1131221999. The next prime is 1131222011. The reversal of 1131222001 is 1002221311.

It is a cyclic number.

It is not a de Polignac number, because 1131222001 - 2¹ = 1131221999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1131222011) 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, 138631 + ... + 146563.

It is an arithmetic number, because the mean of its divisors is an integer number (87083584).

Almost surely, 2^1131222001 is an apocalyptic number.

It is an amenable number.

1131222001 is a deficient number, since it is larger than the sum of its proper divisors (262115343).

1131222001 is a wasteful number, since it uses less digits than its factorization.

1131222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9520.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1131222001 is about 33633.6438852528. The cubic root of 1131222001 is about 1041.9557629106.

Adding to 1131222001 its reverse (1002221311), we get a palindrome (2133443312).

The spelling of 1131222001 in words is "one billion, one hundred thirty-one million, two hundred twenty-two thousand, one".