1021531129 has 2 divisors, whose sum is σ = 1021531130. Its totient is φ = 1021531128.

The previous prime is 1021531123. The next prime is 1021531163. The reversal of 1021531129 is 9211351201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749281129 + 272250000 = 27373^2 + 16500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021531129 - 2⁵ = 1021531097 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021531123) 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 as a sum of consecutive naturals, namely, 510765564 + 510765565.

It is an arithmetic number, because the mean of its divisors is an integer number (510765565).

Almost surely, 2^1021531129 is an apocalyptic number.

It is an amenable number.

1021531129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021531129 is an equidigital number, since it uses as much as digits as its factorization.

1021531129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 1021531129 is about 31961.4006107367. The cubic root of 1021531129 is about 1007.1261404954.

The spelling of 1021531129 in words is "one billion, twenty-one million, five hundred thirty-one thousand, one hundred twenty-nine".