121239031 has 2 divisors, whose sum is σ = 121239032. Its totient is φ = 121239030.

The previous prime is 121239029. The next prime is 121239043. The reversal of 121239031 is 130932121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121239031 - 2¹ = 121239029 is a prime.

It is a super-2 number, since 2×121239031² = 29397805275637922, which contains 22 as substring.

Together with 121239029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121238993 and 121239011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121239061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60619515 + 60619516.

It is an arithmetic number, because the mean of its divisors is an integer number (60619516).

Almost surely, 2^121239031 is an apocalyptic number.

121239031 is a deficient number, since it is larger than the sum of its proper divisors (1).

121239031 is an equidigital number, since it uses as much as digits as its factorization.

121239031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 121239031 is about 11010.8596848747. The cubic root of 121239031 is about 494.9342238213.

The spelling of 121239031 in words is "one hundred twenty-one million, two hundred thirty-nine thousand, thirty-one".