31001144 has 8 divisors (see below), whose sum is σ = 58127160. Its totient is φ = 15500568.

The previous prime is 31001143. The next prime is 31001161. The reversal of 31001144 is 44110013.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31001144² = 1922141858617472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1937564 + ... + 1937579.

It is an arithmetic number, because the mean of its divisors is an integer number (7265895).

Almost surely, 2^31001144 is an apocalyptic number.

It is an amenable number.

31001144 is a deficient number, since it is larger than the sum of its proper divisors (27126016).

31001144 is a wasteful number, since it uses less digits than its factorization.

31001144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875149 (or 3875145 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 31001144 is about 5567.8670961150. The cubic root of 31001144 is about 314.1419294276.

Adding to 31001144 its reverse (44110013), we get a palindrome (75111157).

The spelling of 31001144 in words is "thirty-one million, one thousand, one hundred forty-four".