212409031 has 2 divisors, whose sum is σ = 212409032. Its totient is φ = 212409030.

The previous prime is 212409013. The next prime is 212409053. The reversal of 212409031 is 130904212.

212409031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (212409013) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (212409053) can be obtained adding 212409031 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212409031 - 2²⁷ = 78191303 is a prime.

It is a super-2 number, since 2×212409031² = 90235192900717922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212408993 and 212409011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212409011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106204515 + 106204516.

It is an arithmetic number, because the mean of its divisors is an integer number (106204516).

Almost surely, 2^212409031 is an apocalyptic number.

212409031 is a deficient number, since it is larger than the sum of its proper divisors (1).

212409031 is an equidigital number, since it uses as much as digits as its factorization.

212409031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 212409031 is about 14574.2591921511. The cubic root of 212409031 is about 596.6564308902.

The spelling of 212409031 in words is "two hundred twelve million, four hundred nine thousand, thirty-one".