1045105621 has 16 divisors (see below), whose sum is σ = 1287941760. Its totient is φ = 827953920.

The previous prime is 1045105603. The next prime is 1045105631. The reversal of 1045105621 is 1265015401.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1045105621 - 2⁷ = 1045105493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045105601) 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 15 ways as a sum of consecutive naturals, for example, 90376 + ... + 101281.

It is an arithmetic number, because the mean of its divisors is an integer number (80496360).

Almost surely, 2^1045105621 is an apocalyptic number.

It is an amenable number.

1045105621 is a deficient number, since it is larger than the sum of its proper divisors (242836139).

1045105621 is a wasteful number, since it uses less digits than its factorization.

1045105621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191724.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1045105621 is about 32328.0933709367. The cubic root of 1045105621 is about 1014.8146493552.

The spelling of 1045105621 in words is "one billion, forty-five million, one hundred five thousand, six hundred twenty-one".