1310020121 has 4 divisors (see below), whose sum is σ = 1310092644. Its totient is φ = 1309947600.

The previous prime is 1310020109. The next prime is 1310020123. The reversal of 1310020121 is 1210200131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 61387225 + 1248632896 = 7835^2 + 35336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1310020121 - 2²² = 1305825817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1310020123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14831 + ... + 53291.

It is an arithmetic number, because the mean of its divisors is an integer number (327523161).

Almost surely, 2^1310020121 is an apocalyptic number.

It is an amenable number.

1310020121 is a deficient number, since it is larger than the sum of its proper divisors (72523).

1310020121 is an equidigital number, since it uses as much as digits as its factorization.

1310020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72522.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1310020121 is about 36194.2001016737. The cubic root of 1310020121 is about 1094.1897833908.

Adding to 1310020121 its reverse (1210200131), we get a palindrome (2520220252).

The spelling of 1310020121 in words is "one billion, three hundred ten million, twenty thousand, one hundred twenty-one".