31012121 has 16 divisors (see below), whose sum is σ = 36799488. Its totient is φ = 25574400.

The previous prime is 31012117. The next prime is 31012127. The reversal of 31012121 is 12121013.

It is a cyclic number.

It is not a de Polignac number, because 31012121 - 2² = 31012117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31012127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52001 + ... + 52593.

It is an arithmetic number, because the mean of its divisors is an integer number (2299968).

Almost surely, 2^31012121 is an apocalyptic number.

31012121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31012121 is a deficient number, since it is larger than the sum of its proper divisors (5787367).

31012121 is a wasteful number, since it uses less digits than its factorization.

31012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 31012121 is about 5568.8527543831. The cubic root of 31012121 is about 314.1790025653.

Adding to 31012121 its reverse (12121013), we get a palindrome (43133134).

The spelling of 31012121 in words is "thirty-one million, twelve thousand, one hundred twenty-one".