1021538531 has 8 divisors (see below), whose sum is σ = 1106479920. Its totient is φ = 937505952.

The previous prime is 1021538527. The next prime is 1021538533. The reversal of 1021538531 is 1358351201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1021538531 - 2² = 1021538527 is a prime.

It is a super-2 number, since 2×1021538531² = 2087081940635275922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021538494 and 1021538503.

It is not an unprimeable number, because it can be changed into a prime (1021538533) 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, 224861 + ... + 229358.

It is an arithmetic number, because the mean of its divisors is an integer number (138309990).

Almost surely, 2^1021538531 is an apocalyptic number.

1021538531 is a deficient number, since it is larger than the sum of its proper divisors (84941389).

1021538531 is a wasteful number, since it uses less digits than its factorization.

1021538531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454405.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1021538531 is about 31961.5164064536. The cubic root of 1021538531 is about 1007.1285730301.

Adding to 1021538531 its reverse (1358351201), we get a palindrome (2379889732).

The spelling of 1021538531 in words is "one billion, twenty-one million, five hundred thirty-eight thousand, five hundred thirty-one".