1312012145 has 16 divisors (see below), whose sum is σ = 1668383568. Its totient is φ = 987064320.

The previous prime is 1312012139. The next prime is 1312012153. The reversal of 1312012145 is 5412102131.

It can be written as a sum of positive squares in 8 ways, for example, as 90649441 + 1221362704 = 9521^2 + 34948^2 .

It is not a de Polignac number, because 1312012145 - 2⁴ = 1312012129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111797 + ... + 122973.

It is an arithmetic number, because the mean of its divisors is an integer number (104273973).

Almost surely, 2^1312012145 is an apocalyptic number.

It is an amenable number.

1312012145 is a deficient number, since it is larger than the sum of its proper divisors (356371423).

1312012145 is a wasteful number, since it uses less digits than its factorization.

1312012145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580.

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

The square root of 1312012145 is about 36221.7082010222. The cubic root of 1312012145 is about 1094.7441129031.

Adding to 1312012145 its reverse (5412102131), we get a palindrome (6724114276).

The spelling of 1312012145 in words is "one billion, three hundred twelve million, twelve thousand, one hundred forty-five".