210040031 has 4 divisors (see below), whose sum is σ = 210120000. Its totient is φ = 209960064.

The previous prime is 210040027. The next prime is 210040067. The reversal of 210040031 is 130040012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 210040031 - 2² = 210040027 is a prime.

It is a super-2 number, since 2×210040031² = 88233629244961922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210039994 and 210040021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210040001) 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, 35906 + ... + 41343.

It is an arithmetic number, because the mean of its divisors is an integer number (52530000).

Almost surely, 2^210040031 is an apocalyptic number.

210040031 is a deficient number, since it is larger than the sum of its proper divisors (79969).

210040031 is an equidigital number, since it uses as much as digits as its factorization.

210040031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79968.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 210040031 is about 14492.7578810936. The cubic root of 210040031 is about 594.4299613116.

Adding to 210040031 its reverse (130040012), we get a palindrome (340080043).

The spelling of 210040031 in words is "two hundred ten million, forty thousand, thirty-one".