1021661061 has 8 divisors (see below), whose sum is σ = 1380875520. Its totient is φ = 671776992.

The previous prime is 1021661059. The next prime is 1021661071. The reversal of 1021661061 is 1601661201.

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

It is not a de Polignac number, because 1021661061 - 2¹ = 1021661059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021661071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2332341 + ... + 2332778.

It is an arithmetic number, because the mean of its divisors is an integer number (172609440).

Almost surely, 2^1021661061 is an apocalyptic number.

It is an amenable number.

1021661061 is a deficient number, since it is larger than the sum of its proper divisors (359214459).

1021661061 is an equidigital number, since it uses as much as digits as its factorization.

1021661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665195.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1021661061 is about 31963.4331854386. The cubic root of 1021661061 is about 1007.1688386120.

The spelling of 1021661061 in words is "one billion, twenty-one million, six hundred sixty-one thousand, sixty-one".