1131396397 has 4 divisors (see below), whose sum is σ = 1161974716. Its totient is φ = 1100818080.

The previous prime is 1131396389. The next prime is 1131396403. The reversal of 1131396397 is 7936931311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 716418756 + 414977641 = 26766^2 + 20371^2 .

It is not a de Polignac number, because 1131396397 - 2³ = 1131396389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131396337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15289104 + ... + 15289177.

It is an arithmetic number, because the mean of its divisors is an integer number (290493679).

Almost surely, 2^1131396397 is an apocalyptic number.

It is an amenable number.

1131396397 is a deficient number, since it is larger than the sum of its proper divisors (30578319).

1131396397 is an equidigital number, since it uses as much as digits as its factorization.

1131396397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30578318.

The product of its digits is 91854, while the sum is 43.

The square root of 1131396397 is about 33636.2363679410. The cubic root of 1131396397 is about 1042.0093048856.

The spelling of 1131396397 in words is "one billion, one hundred thirty-one million, three hundred ninety-six thousand, three hundred ninety-seven".