1310123121 has 16 divisors (see below), whose sum is σ = 1798785024. Its totient is φ = 847563264.

The previous prime is 1310123119. The next prime is 1310123149. The reversal of 1310123121 is 1213210131.

It is a happy number.

It is not a de Polignac number, because 1310123121 - 2¹ = 1310123119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1310123121.

It is not an unprimeable number, because it can be changed into a prime (1310124121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27105 + ... + 57921.

It is an arithmetic number, because the mean of its divisors is an integer number (112424064).

Almost surely, 2^1310123121 is an apocalyptic number.

It is an amenable number.

1310123121 is a deficient number, since it is larger than the sum of its proper divisors (488661903).

1310123121 is a wasteful number, since it uses less digits than its factorization.

1310123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31240.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1310123121 is about 36195.6229536114. The cubic root of 1310123121 is about 1094.2184594374.

Adding to 1310123121 its reverse (1213210131), we get a palindrome (2523333252).

The spelling of 1310123121 in words is "one billion, three hundred ten million, one hundred twenty-three thousand, one hundred twenty-one".