312121413 has 6 divisors (see below), whose sum is σ = 450842054. Its totient is φ = 208080936.

The previous prime is 312121373. The next prime is 312121429. The reversal of 312121413 is 314121213.

It can be written as a sum of positive squares in only one way, i.e., 305480484 + 6640929 = 17478^2 + 2577^2 .

It is not a de Polignac number, because 312121413 - 2¹⁴ = 312105029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312121013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17340070 + ... + 17340087.

Almost surely, 2^312121413 is an apocalyptic number.

It is an amenable number.

312121413 is a deficient number, since it is larger than the sum of its proper divisors (138720641).

312121413 is a wasteful number, since it uses less digits than its factorization.

312121413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34680163 (or 34680160 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 312121413 is about 17666.9582271539. The cubic root of 312121413 is about 678.3302552178.

Adding to 312121413 its reverse (314121213), we get a palindrome (626242626).

The spelling of 312121413 in words is "three hundred twelve million, one hundred twenty-one thousand, four hundred thirteen".