1021541165 has 8 divisors (see below), whose sum is σ = 1226139768. Its totient is φ = 817039360.

The previous prime is 1021541141. The next prime is 1021541167. The reversal of 1021541165 is 5611451201.

It can be written as a sum of positive squares in 4 ways, for example, as 432556804 + 588984361 = 20798^2 + 24269^2 .

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

It is not a de Polignac number, because 1021541165 - 2²⁸ = 753105709 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 (1021541167) 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, 1505 + ... + 45225.

It is an arithmetic number, because the mean of its divisors is an integer number (153267471).

Almost surely, 2^1021541165 is an apocalyptic number.

It is an amenable number.

1021541165 is a deficient number, since it is larger than the sum of its proper divisors (204598603).

1021541165 is an equidigital number, since it uses as much as digits as its factorization.

1021541165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48399.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1021541165 is about 31961.5576122316. The cubic root of 1021541165 is about 1007.1294386441.

Adding to 1021541165 its reverse (5611451201), we get a palindrome (6632992366).

The spelling of 1021541165 in words is "one billion, twenty-one million, five hundred forty-one thousand, one hundred sixty-five".