1081579621 has 8 divisors (see below), whose sum is σ = 1120368600. Its totient is φ = 1042890240.

The previous prime is 1081579589. The next prime is 1081579633. The reversal of 1081579621 is 1269751801.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 115240225 + 966339396 = 10735^2 + 31086^2 .

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 1081579621 - 2⁵ = 1081579589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081579691) 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, 2436 + ... + 46573.

It is an arithmetic number, because the mean of its divisors is an integer number (140046075).

Almost surely, 2^1081579621 is an apocalyptic number.

It is an amenable number.

1081579621 is a deficient number, since it is larger than the sum of its proper divisors (38788979).

1081579621 is an equidigital number, since it uses as much as digits as its factorization.

1081579621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49799.

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 1081579621 is about 32887.3778370973. The cubic root of 1081579621 is about 1026.4855306153.

The spelling of 1081579621 in words is "one billion, eighty-one million, five hundred seventy-nine thousand, six hundred twenty-one".