1171385531 has 2 divisors, whose sum is σ = 1171385532. Its totient is φ = 1171385530.

The previous prime is 1171385519. The next prime is 1171385563. The reversal of 1171385531 is 1355831711.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1171385531 is a prime.

It is a super-2 number, since 2×1171385531² = 2744288124472303922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1171385491 and 1171385500.

It is not a weakly prime, because it can be changed into another prime (1171384531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585692765 + 585692766.

It is an arithmetic number, because the mean of its divisors is an integer number (585692766).

Almost surely, 2^1171385531 is an apocalyptic number.

1171385531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171385531 is an equidigital number, since it uses as much as digits as its factorization.

1171385531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 35.

The square root of 1171385531 is about 34225.5099450688. The cubic root of 1171385531 is about 1054.1440257128.

The spelling of 1171385531 in words is "one billion, one hundred seventy-one million, three hundred eighty-five thousand, five hundred thirty-one".