1131394973 has 4 divisors (see below), whose sum is σ = 1157706528. Its totient is φ = 1105083420.

The previous prime is 1131394963. The next prime is 1131394997. The reversal of 1131394973 is 3794931311.

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 a de Polignac number, because none of the positive numbers 2^k-1131394973 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 1131394973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131394903) 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, 13155713 + ... + 13155798.

It is an arithmetic number, because the mean of its divisors is an integer number (289426632).

Almost surely, 2^1131394973 is an apocalyptic number.

It is an amenable number.

1131394973 is a deficient number, since it is larger than the sum of its proper divisors (26311555).

1131394973 is an equidigital number, since it uses as much as digits as its factorization.

1131394973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26311554.

The product of its digits is 61236, while the sum is 41.

The square root of 1131394973 is about 33636.2152002867. The cubic root of 1131394973 is about 1042.0088677202.

The spelling of 1131394973 in words is "one billion, one hundred thirty-one million, three hundred ninety-four thousand, nine hundred seventy-three".