312101381 has 2 divisors, whose sum is σ = 312101382. Its totient is φ = 312101380.

The previous prime is 312101371. The next prime is 312101423. The reversal of 312101381 is 183101213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307300900 + 4800481 = 17530^2 + 2191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312101381 is a prime.

It is a super-2 number, since 2×312101381² = 194814544044214322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312101341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156050690 + 156050691.

It is an arithmetic number, because the mean of its divisors is an integer number (156050691).

Almost surely, 2^312101381 is an apocalyptic number.

It is an amenable number.

312101381 is a deficient number, since it is larger than the sum of its proper divisors (1).

312101381 is an equidigital number, since it uses as much as digits as its factorization.

312101381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 312101381 is about 17666.3912840172. The cubic root of 312101381 is about 678.3157431275.

Adding to 312101381 its reverse (183101213), we get a palindrome (495202594).

The spelling of 312101381 in words is "three hundred twelve million, one hundred one thousand, three hundred eighty-one".