31451121 has 12 divisors (see below), whose sum is σ = 48924148. Its totient is φ = 19354464.

The previous prime is 31451111. The next prime is 31451149. The reversal of 31451121 is 12115413.

It can be written as a sum of positive squares in 2 ways, for example, as 7096896 + 24354225 = 2664^2 + 4935^2 .

It is not a de Polignac number, because 31451121 - 2¹⁷ = 31320049 is a prime.

It is a super-3 number, since 3×31451121³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31451094 and 31451103.

It is not an unprimeable number, because it can be changed into a prime (31451111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134290 + ... + 134523.

Almost surely, 2^31451121 is an apocalyptic number.

It is an amenable number.

31451121 is a deficient number, since it is larger than the sum of its proper divisors (17473027).

31451121 is a wasteful number, since it uses less digits than its factorization.

31451121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268832 (or 268829 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 31451121 is about 5608.1299022045. The cubic root of 31451121 is about 315.6545422271.

Adding to 31451121 its reverse (12115413), we get a palindrome (43566534).

The spelling of 31451121 in words is "thirty-one million, four hundred fifty-one thousand, one hundred twenty-one".