1131402221 has 8 divisors (see below), whose sum is σ = 1140648600. Its totient is φ = 1122189120.

The previous prime is 1131402211. The next prime is 1131402229. The reversal of 1131402221 is 1222041311.

It can be written as a sum of positive squares in 4 ways, for example, as 50965321 + 1080436900 = 7139^2 + 32870^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131402221 - 2¹⁸ = 1131140077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131402221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131402229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62375 + ... + 78443.

It is an arithmetic number, because the mean of its divisors is an integer number (142581075).

Almost surely, 2^1131402221 is an apocalyptic number.

It is an amenable number.

1131402221 is a deficient number, since it is larger than the sum of its proper divisors (9246379).

1131402221 is a wasteful number, since it uses less digits than its factorization.

1131402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16639.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1131402221 is about 33636.3229411302. The cubic root of 1131402221 is about 1042.0110928389.

Adding to 1131402221 its reverse (1222041311), we get a palindrome (2353443532).

The spelling of 1131402221 in words is "one billion, one hundred thirty-one million, four hundred two thousand, two hundred twenty-one".