1061991266 has 16 divisors (see below), whose sum is σ = 1864961280. Its totient is φ = 444037920.

The previous prime is 1061991221. The next prime is 1061991269. The reversal of 1061991266 is 6621991601.

It is a super-2 number, since 2×1061991266² = 2255650898120565512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (1061991269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924506 + ... + 925653.

It is an arithmetic number, because the mean of its divisors is an integer number (116560080).

Almost surely, 2^1061991266 is an apocalyptic number.

1061991266 is a deficient number, since it is larger than the sum of its proper divisors (802970014).

1061991266 is a wasteful number, since it uses less digits than its factorization.

1061991266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850209.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1061991266 is about 32588.2074683466. The cubic root of 1061991266 is about 1020.2508885596.

The spelling of 1061991266 in words is "one billion, sixty-one million, nine hundred ninety-one thousand, two hundred sixty-six".