1057531081 has 8 divisors (see below), whose sum is σ = 1120681800. Its totient is φ = 996159360.

The previous prime is 1057531073. The next prime is 1057531091. The reversal of 1057531081 is 1801357501.

It can be written as a sum of positive squares in 4 ways, for example, as 6734025 + 1050797056 = 2595^2 + 32416^2 .

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 1057531081 - 2³ = 1057531073 is a prime.

It is a super-2 number, since 2×1057531081² = 2236743974562057122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1057531061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443526 + ... + 445903.

It is an arithmetic number, because the mean of its divisors is an integer number (140085225).

Almost surely, 2^1057531081 is an apocalyptic number.

It is an amenable number.

1057531081 is a deficient number, since it is larger than the sum of its proper divisors (63150719).

1057531081 is an equidigital number, since it uses as much as digits as its factorization.

1057531081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889499.

The product of its (nonzero) digits is 4200, while the sum is 31.

The square root of 1057531081 is about 32519.7029660481. The cubic root of 1057531081 is about 1018.8205902082.

Adding to 1057531081 its reverse (1801357501), we get a palindrome (2858888582).

The spelling of 1057531081 in words is "one billion, fifty-seven million, five hundred thirty-one thousand, eighty-one".