31007161 has 4 divisors (see below), whose sum is σ = 32007424. Its totient is φ = 30006900.

The previous prime is 31007159. The next prime is 31007213. The reversal of 31007161 is 16170013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31007161 - 2¹ = 31007159 is a prime.

It is a super-2 number, since 2×31007161² = 1922888066559842, which contains 22 as substring.

It is a Duffinian number.

31007161 is a modest number, since divided by 7161 gives 31 as remainder.

It is not an unprimeable number, because it can be changed into a prime (31007861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500085 + ... + 500146.

It is an arithmetic number, because the mean of its divisors is an integer number (8001856).

Almost surely, 2^31007161 is an apocalyptic number.

31007161 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31007161 is a deficient number, since it is larger than the sum of its proper divisors (1000263).

31007161 is a wasteful number, since it uses less digits than its factorization.

31007161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000262.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 31007161 is about 5568.4074024805. The cubic root of 31007161 is about 314.1622520079.

Adding to 31007161 its reverse (16170013), we get a palindrome (47177174).

The spelling of 31007161 in words is "thirty-one million, seven thousand, one hundred sixty-one".