1131973397 has 4 divisors (see below), whose sum is σ = 1133612256. Its totient is φ = 1130334540.

The previous prime is 1131973391. The next prime is 1131973411. The reversal of 1131973397 is 7933791311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1131973397 - 2¹² = 1131969301 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 (1131973391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818393 + ... + 819774.

It is an arithmetic number, because the mean of its divisors is an integer number (283403064).

Almost surely, 2^1131973397 is an apocalyptic number.

It is an amenable number.

1131973397 is a deficient number, since it is larger than the sum of its proper divisors (1638859).

1131973397 is an equidigital number, since it uses as much as digits as its factorization.

1131973397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638858.

The product of its digits is 107163, while the sum is 44.

The square root of 1131973397 is about 33644.8123341474. The cubic root of 1131973397 is about 1042.1864126293.

The spelling of 1131973397 in words is "one billion, one hundred thirty-one million, nine hundred seventy-three thousand, three hundred ninety-seven".