121311031 has 16 divisors (see below), whose sum is σ = 134222400. Its totient is φ = 109122048.

The previous prime is 121311019. The next prime is 121311053. The reversal of 121311031 is 130113121.

It is not a de Polignac number, because 121311031 - 2¹⁵ = 121278263 is a prime.

It is a super-2 number, since 2×121311031² = 29432732484565922, 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 (121311431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49585 + ... + 51973.

It is an arithmetic number, because the mean of its divisors is an integer number (8388900).

Almost surely, 2^121311031 is an apocalyptic number.

121311031 is a deficient number, since it is larger than the sum of its proper divisors (12911369).

121311031 is a wasteful number, since it uses less digits than its factorization.

121311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538.

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

The square root of 121311031 is about 11014.1286990846. The cubic root of 121311031 is about 495.0321796581.

Adding to 121311031 its reverse (130113121), we get a palindrome (251424152).

The spelling of 121311031 in words is "one hundred twenty-one million, three hundred eleven thousand, thirty-one".