31126481 has 4 divisors (see below), whose sum is σ = 31215012. Its totient is φ = 31037952.

The previous prime is 31126457. The next prime is 31126559. The reversal of 31126481 is 18462113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18462113 = 421 ⋅43853.

It can be written as a sum of positive squares in 2 ways, for example, as 16072081 + 15054400 = 4009^2 + 3880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31126481 is a prime.

It is a super-2 number, since 2×31126481² = 1937715638886722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31126481.

It is not an unprimeable number, because it can be changed into a prime (31126441) 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, 43736 + ... + 44441.

It is an arithmetic number, because the mean of its divisors is an integer number (7803753).

Almost surely, 2^31126481 is an apocalyptic number.

It is an amenable number.

31126481 is a deficient number, since it is larger than the sum of its proper divisors (88531).

31126481 is an equidigital number, since it uses as much as digits as its factorization.

31126481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88530.

The product of its digits is 1152, while the sum is 26.

The square root of 31126481 is about 5579.1111299202. Note that the first 4 decimals coincide. The cubic root of 31126481 is about 314.5647166602.

Adding to 31126481 its reverse (18462113), we get a palindrome (49588594).

The spelling of 31126481 in words is "thirty-one million, one hundred twenty-six thousand, four hundred eighty-one".