1045551621 has 8 divisors (see below), whose sum is σ = 1399252320. Its totient is φ = 694442672.

The previous prime is 1045551593. The next prime is 1045551659. The reversal of 1045551621 is 1261555401.

1045551621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1045551621 - 2⁶ = 1045551557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045551671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646995 + ... + 648608.

It is an arithmetic number, because the mean of its divisors is an integer number (174906540).

Almost surely, 2^1045551621 is an apocalyptic number.

It is an amenable number.

1045551621 is a deficient number, since it is larger than the sum of its proper divisors (353700699).

1045551621 is a wasteful number, since it uses less digits than its factorization.

1045551621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295875.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 1045551621 is about 32334.9906602739. The cubic root of 1045551621 is about 1014.9589865897.

The spelling of 1045551621 in words is "one billion, forty-five million, five hundred fifty-one thousand, six hundred twenty-one".