1021660361 has 8 divisors (see below), whose sum is σ = 1027846920. Its totient is φ = 1015483392.

The previous prime is 1021660313. The next prime is 1021660403. The reversal of 1021660361 is 1630661201.

It can be written as a sum of positive squares in 4 ways, for example, as 12645136 + 1009015225 = 3556^2 + 31765^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021660361 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 1021660361.

It is not an unprimeable number, because it can be changed into a prime (1021660301) 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, 436751 + ... + 439083.

It is an arithmetic number, because the mean of its divisors is an integer number (128480865).

Almost surely, 2^1021660361 is an apocalyptic number.

It is an amenable number.

1021660361 is a deficient number, since it is larger than the sum of its proper divisors (6186559).

1021660361 is a wasteful number, since it uses less digits than its factorization.

1021660361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1021660361 is about 31963.4222354240. The cubic root of 1021660361 is about 1007.1686085885.

The spelling of 1021660361 in words is "one billion, twenty-one million, six hundred sixty thousand, three hundred sixty-one".