1031340521 has 4 divisors (see below), whose sum is σ = 1038868692. Its totient is φ = 1023812352.

The previous prime is 1031340503. The next prime is 1031340523. The reversal of 1031340521 is 1250431301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1250431301 = 7 ⋅178633043.

It can be written as a sum of positive squares in 2 ways, for example, as 860776921 + 170563600 = 29339^2 + 13060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031340521 - 2¹⁴ = 1031324137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031340493 and 1031340502.

It is not an unprimeable number, because it can be changed into a prime (1031340523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3763880 + ... + 3764153.

It is an arithmetic number, because the mean of its divisors is an integer number (259717173).

Almost surely, 2^1031340521 is an apocalyptic number.

It is an amenable number.

1031340521 is a deficient number, since it is larger than the sum of its proper divisors (7528171).

1031340521 is an equidigital number, since it uses as much as digits as its factorization.

1031340521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528170.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1031340521 is about 32114.4908257939. The cubic root of 1031340521 is about 1010.3395652675.

Adding to 1031340521 its reverse (1250431301), we get a palindrome (2281771822).

The spelling of 1031340521 in words is "one billion, thirty-one million, three hundred forty thousand, five hundred twenty-one".