31311145 has 8 divisors (see below), whose sum is σ = 39551040. Its totient is φ = 23730480.

The previous prime is 31311143. The next prime is 31311157. The reversal of 31311145 is 54111313.

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

It is not a de Polignac number, because 31311145 - 2¹ = 31311143 is a prime.

It is a super-2 number, since 2×31311145² = 1960775602422050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (31311143) 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, 164701 + ... + 164890.

It is an arithmetic number, because the mean of its divisors is an integer number (4943880).

Almost surely, 2^31311145 is an apocalyptic number.

It is an amenable number.

31311145 is a deficient number, since it is larger than the sum of its proper divisors (8239895).

31311145 is a wasteful number, since it uses less digits than its factorization.

31311145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329615.

The product of its digits is 180, while the sum is 19.

The square root of 31311145 is about 5595.6362462190. The cubic root of 31311145 is about 315.1855629591.

Adding to 31311145 its reverse (54111313), we get a palindrome (85422458).

The spelling of 31311145 in words is "thirty-one million, three hundred eleven thousand, one hundred forty-five".