31243161 has 8 divisors (see below), whose sum is σ = 44108064. Its totient is φ = 19603520.

The previous prime is 31243151. The next prime is 31243181. The reversal of 31243161 is 16134213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31243161 - 2⁶ = 31243097 is a prime.

It is a super-2 number, since 2×31243161² = 1952270218543842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31243111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306255 + ... + 306356.

It is an arithmetic number, because the mean of its divisors is an integer number (5513508).

Almost surely, 2^31243161 is an apocalyptic number.

It is an amenable number.

31243161 is a deficient number, since it is larger than the sum of its proper divisors (12864903).

31243161 is a wasteful number, since it uses less digits than its factorization.

31243161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612631.

The product of its digits is 432, while the sum is 21.

The square root of 31243161 is about 5589.5582115226. The cubic root of 31243161 is about 314.9572831972.

Adding to 31243161 its reverse (16134213), we get a palindrome (47377374).

The spelling of 31243161 in words is "thirty-one million, two hundred forty-three thousand, one hundred sixty-one".