1135397971 has 4 divisors (see below), whose sum is σ = 1172023744. Its totient is φ = 1098772200.

The previous prime is 1135397969. The next prime is 1135397983. The reversal of 1135397971 is 1797935311.

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

It is a cyclic number.

It is not a de Polignac number, because 1135397971 - 2¹ = 1135397969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1135397951) 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, 18312840 + ... + 18312901.

It is an arithmetic number, because the mean of its divisors is an integer number (293005936).

Almost surely, 2^1135397971 is an apocalyptic number.

1135397971 is a deficient number, since it is larger than the sum of its proper divisors (36625773).

1135397971 is an equidigital number, since it uses as much as digits as its factorization.

1135397971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36625772.

The product of its digits is 178605, while the sum is 46.

The square root of 1135397971 is about 33695.6669469533. Note that the first 3 decimals coincide. The cubic root of 1135397971 is about 1043.2363346443.

The spelling of 1135397971 in words is "one billion, one hundred thirty-five million, three hundred ninety-seven thousand, nine hundred seventy-one".