1045621621 has 8 divisors (see below), whose sum is σ = 1150106688. Its totient is φ = 950563900.

The previous prime is 1045621613. The next prime is 1045621627. The reversal of 1045621621 is 1261265401.

It is not a de Polignac number, because 1045621621 - 2³ = 1045621613 is a prime.

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 1045621621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045621627) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 391465 + ... + 394126.

It is an arithmetic number, because the mean of its divisors is an integer number (143763336).

Almost surely, 2^1045621621 is an apocalyptic number.

1045621621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1045621621 is a deficient number, since it is larger than the sum of its proper divisors (104485067).

1045621621 is an frugal number, since it uses more digits than its factorization.

1045621621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785624 (or 785602 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1045621621 is about 32336.0730609021. The cubic root of 1045621621 is about 1014.9816366888.

The spelling of 1045621621 in words is "one billion, forty-five million, six hundred twenty-one thousand, six hundred twenty-one".