102731121 has 6 divisors (see below), whose sum is σ = 148389410. Its totient is φ = 68487408.

The previous prime is 102731113. The next prime is 102731149. The reversal of 102731121 is 121137201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 53450721 + 49280400 = 7311^2 + 7020^2 .

It is not a de Polignac number, because 102731121 - 2³ = 102731113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102731094 and 102731103.

It is not an unprimeable number, because it can be changed into a prime (102731191) 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, 5707276 + ... + 5707293.

Almost surely, 2^102731121 is an apocalyptic number.

It is an amenable number.

102731121 is a deficient number, since it is larger than the sum of its proper divisors (45658289).

102731121 is a wasteful number, since it uses less digits than its factorization.

102731121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11414575 (or 11414572 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 102731121 is about 10135.6361911821. The cubic root of 102731121 is about 468.3465682977.

Adding to 102731121 its reverse (121137201), we get a palindrome (223868322).

The spelling of 102731121 in words is "one hundred two million, seven hundred thirty-one thousand, one hundred twenty-one".