1111666531 has 4 divisors (see below), whose sum is σ = 1116521200. Its totient is φ = 1106811864.

The previous prime is 1111666529. The next prime is 1111666571. The reversal of 1111666531 is 1356661111.

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 1111666531 - 2¹ = 1111666529 is a prime.

It is a super-2 number, since 2×1111666531² = 2471604952291147922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111666493 and 1111666502.

It is not an unprimeable number, because it can be changed into a prime (1111666511) 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, 2426991 + ... + 2427448.

It is an arithmetic number, because the mean of its divisors is an integer number (279130300).

Almost surely, 2^1111666531 is an apocalyptic number.

1111666531 is a deficient number, since it is larger than the sum of its proper divisors (4854669).

1111666531 is an equidigital number, since it uses as much as digits as its factorization.

1111666531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4854668.

The product of its digits is 3240, while the sum is 31.

The square root of 1111666531 is about 33341.6635907688. The cubic root of 1111666531 is about 1035.9167217760.

The spelling of 1111666531 in words is "one billion, one hundred eleven million, six hundred sixty-six thousand, five hundred thirty-one".