1021543161 has 8 divisors (see below), whose sum is σ = 1362880320. Its totient is φ = 680617392.

The previous prime is 1021543129. The next prime is 1021543163. The reversal of 1021543161 is 1613451201.

It is a happy number.

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

It is not a de Polignac number, because 1021543161 - 2⁵ = 1021543129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021543163) 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, 97005 + ... + 107018.

It is an arithmetic number, because the mean of its divisors is an integer number (170360040).

Almost surely, 2^1021543161 is an apocalyptic number.

It is an amenable number.

1021543161 is a deficient number, since it is larger than the sum of its proper divisors (341337159).

1021543161 is a wasteful number, since it uses less digits than its factorization.

1021543161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205695.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1021543161 is about 31961.5888372277. The cubic root of 1021543161 is about 1007.1300945906.

Adding to 1021543161 its reverse (1613451201), we get a palindrome (2634994362).

The spelling of 1021543161 in words is "one billion, twenty-one million, five hundred forty-three thousand, one hundred sixty-one".