1128631621 has 8 divisors (see below), whose sum is σ = 1243716320. Its totient is φ = 1017585072.

The previous prime is 1128631571. The next prime is 1128631627. The reversal of 1128631621 is 1261368211.

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 1128631621 - 2²¹ = 1126534469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128631627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1008951 + ... + 1010068.

It is an arithmetic number, because the mean of its divisors is an integer number (155464540).

Almost surely, 2^1128631621 is an apocalyptic number.

It is an amenable number.

1128631621 is a deficient number, since it is larger than the sum of its proper divisors (115084699).

1128631621 is a wasteful number, since it uses less digits than its factorization.

1128631621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019075.

The product of its digits is 3456, while the sum is 31.

The square root of 1128631621 is about 33595.1130523474. The cubic root of 1128631621 is about 1041.1598318494.

Adding to 1128631621 its reverse (1261368211), we get a palindrome (2389999832).

The spelling of 1128631621 in words is "one billion, one hundred twenty-eight million, six hundred thirty-one thousand, six hundred twenty-one".