1121866631 has 4 divisors (see below), whose sum is σ = 1122278664. Its totient is φ = 1121454600.

The previous prime is 1121866621. The next prime is 1121866639. The reversal of 1121866631 is 1366681211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121866631 is a prime.

It is a super-2 number, since 2×1121866631² = 2517169475502580322, 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 = 1121866591 and 1121866600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121866639) 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, 201905 + ... + 207386.

It is an arithmetic number, because the mean of its divisors is an integer number (280569666).

Almost surely, 2^1121866631 is an apocalyptic number.

1121866631 is a deficient number, since it is larger than the sum of its proper divisors (412033).

1121866631 is an equidigital number, since it uses as much as digits as its factorization.

1121866631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412032.

The product of its digits is 10368, while the sum is 35.

The square root of 1121866631 is about 33494.2775858802. The cubic root of 1121866631 is about 1039.0754329199.

The spelling of 1121866631 in words is "one billion, one hundred twenty-one million, eight hundred sixty-six thousand, six hundred thirty-one".