1331531057 has 4 divisors (see below), whose sum is σ = 1354099440. Its totient is φ = 1308962676.

The previous prime is 1331531053. The next prime is 1331531081. The reversal of 1331531057 is 7501351331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7501351331 = 20509 ⋅365759.

It is a cyclic number.

It is not a de Polignac number, because 1331531057 - 2² = 1331531053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331531053) 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 3 ways as a sum of consecutive naturals, for example, 11284103 + ... + 11284220.

It is an arithmetic number, because the mean of its divisors is an integer number (338524860).

Almost surely, 2^1331531057 is an apocalyptic number.

It is an amenable number.

1331531057 is a deficient number, since it is larger than the sum of its proper divisors (22568383).

1331531057 is an equidigital number, since it uses as much as digits as its factorization.

1331531057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22568382.

The product of its (nonzero) digits is 4725, while the sum is 29.

The square root of 1331531057 is about 36490.1501367150. The cubic root of 1331531057 is about 1100.1462772415.

Adding to 1331531057 its reverse (7501351331), we get a palindrome (8832882388).

The spelling of 1331531057 in words is "one billion, three hundred thirty-one million, five hundred thirty-one thousand, fifty-seven".