1045420181 has 4 divisors (see below), whose sum is σ = 1125837132. Its totient is φ = 965003232.

The previous prime is 1045420133. The next prime is 1045420213. The reversal of 1045420181 is 1810245401.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63600625 + 981819556 = 7975^2 + 31334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1045420181 is a prime.

It is a super-2 number, since 2×1045420181² = 2185806709684145522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1045420181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045420121) 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, 40208456 + ... + 40208481.

It is an arithmetic number, because the mean of its divisors is an integer number (281459283).

Almost surely, 2^1045420181 is an apocalyptic number.

It is an amenable number.

1045420181 is a deficient number, since it is larger than the sum of its proper divisors (80416951).

1045420181 is an equidigital number, since it uses as much as digits as its factorization.

1045420181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80416950.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 1045420181 is about 32332.9581232525. The cubic root of 1045420181 is about 1014.9164534435.

Adding to 1045420181 its reverse (1810245401), we get a palindrome (2855665582).

The spelling of 1045420181 in words is "one billion, forty-five million, four hundred twenty thousand, one hundred eighty-one".