1021531066 has 4 divisors (see below), whose sum is σ = 1532296602. Its totient is φ = 510765532.

The previous prime is 1021531009. The next prime is 1021531073. The reversal of 1021531066 is 6601351201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6601351201 = 727 ⋅9080263.

It can be written as a sum of positive squares in only one way, i.e., 969388225 + 52142841 = 31135^2 + 7221^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1021531066.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255382765 + ... + 255382768.

Almost surely, 2^1021531066 is an apocalyptic number.

1021531066 is a deficient number, since it is larger than the sum of its proper divisors (510765536).

1021531066 is an equidigital number, since it uses as much as digits as its factorization.

1021531066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510765535.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1021531066 is about 31961.3996251729. The cubic root of 1021531066 is about 1007.1261197915.

Adding to 1021531066 its reverse (6601351201), we get a palindrome (7622882267).

The spelling of 1021531066 in words is "one billion, twenty-one million, five hundred thirty-one thousand, sixty-six".