312131101 has 4 divisors (see below), whose sum is σ = 330491772. Its totient is φ = 293770432.

The previous prime is 312131087. The next prime is 312131119. The reversal of 312131101 is 101131213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101131213 = 1187 ⋅85199.

It can be written as a sum of positive squares in 2 ways, for example, as 268107876 + 44023225 = 16374^2 + 6635^2 .

It is a cyclic number.

It is not a de Polignac number, because 312131101 - 2⁹ = 312130589 is a prime.

It is a super-2 number, since 2×312131101² = 194851648422944402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312131801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9180310 + ... + 9180343.

It is an arithmetic number, because the mean of its divisors is an integer number (82622943).

Almost surely, 2^312131101 is an apocalyptic number.

It is an amenable number.

312131101 is a deficient number, since it is larger than the sum of its proper divisors (18360671).

312131101 is a wasteful number, since it uses less digits than its factorization.

312131101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18360670.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 312131101 is about 17667.2324091806. The cubic root of 312131101 is about 678.3372734221.

Adding to 312131101 its reverse (101131213), we get a palindrome (413262314).

The spelling of 312131101 in words is "three hundred twelve million, one hundred thirty-one thousand, one hundred one".