1071861145 has 4 divisors (see below), whose sum is σ = 1286233380. Its totient is φ = 857488912.

The previous prime is 1071861127. The next prime is 1071861181. The reversal of 1071861145 is 5411681701.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5411681701 = 97 ⋅55790533.

It can be written as a sum of positive squares in 2 ways, for example, as 342213001 + 729648144 = 18499^2 + 27012^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071861145 - 2⁷ = 1071861017 is a prime.

It is a super-2 number, since 2×1071861145² = 2297772628321422050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1071861145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107186110 + ... + 107186119.

It is an arithmetic number, because the mean of its divisors is an integer number (321558345).

Almost surely, 2^1071861145 is an apocalyptic number.

It is an amenable number.

1071861145 is a deficient number, since it is larger than the sum of its proper divisors (214372235).

1071861145 is an equidigital number, since it uses as much as digits as its factorization.

1071861145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214372234.

The product of its (nonzero) digits is 6720, while the sum is 34.

The square root of 1071861145 is about 32739.2905390450. The cubic root of 1071861145 is about 1023.4017988572.

The spelling of 1071861145 in words is "one billion, seventy-one million, eight hundred sixty-one thousand, one hundred forty-five".