1131020402 has 4 divisors (see below), whose sum is σ = 1696530606. Its totient is φ = 565510200.

The previous prime is 1131020347. The next prime is 1131020431. The reversal of 1131020402 is 2040201311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2040201311 = 19483 ⋅104717.

It can be written as a sum of positive squares in only one way, i.e., 1014358801 + 116661601 = 31849^2 + 10801^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282755099 + ... + 282755102.

Almost surely, 2^1131020402 is an apocalyptic number.

1131020402 is a deficient number, since it is larger than the sum of its proper divisors (565510204).

1131020402 is an equidigital number, since it uses as much as digits as its factorization.

1131020402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565510203.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1131020402 is about 33630.6467674947. The cubic root of 1131020402 is about 1041.8938623821.

Adding to 1131020402 its reverse (2040201311), we get a palindrome (3171221713).

The spelling of 1131020402 in words is "one billion, one hundred thirty-one million, twenty thousand, four hundred two".