1031542121 has 4 divisors (see below), whose sum is σ = 1031897472. Its totient is φ = 1031186772.

The previous prime is 1031542103. The next prime is 1031542153. The reversal of 1031542121 is 1212451301.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031542121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031542093 and 1031542102.

It is not an unprimeable number, because it can be changed into a prime (1031542181) 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, 173285 + ... + 179138.

It is an arithmetic number, because the mean of its divisors is an integer number (257974368).

Almost surely, 2^1031542121 is an apocalyptic number.

It is an amenable number.

1031542121 is a deficient number, since it is larger than the sum of its proper divisors (355351).

1031542121 is an equidigital number, since it uses as much as digits as its factorization.

1031542121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355350.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1031542121 is about 32117.6294424106. The cubic root of 1031542121 is about 1010.4053925999.

Adding to 1031542121 its reverse (1212451301), we get a palindrome (2243993422).

The spelling of 1031542121 in words is "one billion, thirty-one million, five hundred forty-two thousand, one hundred twenty-one".