31151145 has 32 divisors (see below), whose sum is σ = 51093504. Its totient is φ = 16203200.

The previous prime is 31151137. The next prime is 31151161. The reversal of 31151145 is 54115113.

It is a happy number.

It is not a de Polignac number, because 31151145 - 2³ = 31151137 is a prime.

It is a super-2 number, since 2×31151145² = 1940787669622050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 163000 + ... + 163190.

It is an arithmetic number, because the mean of its divisors is an integer number (1596672).

Almost surely, 2^31151145 is an apocalyptic number.

It is an amenable number.

31151145 is a deficient number, since it is larger than the sum of its proper divisors (19942359).

31151145 is a wasteful number, since it uses less digits than its factorization.

31151145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413.

The product of its digits is 300, while the sum is 21.

The square root of 31151145 is about 5581.3210801745. The cubic root of 31151145 is about 314.6477796516.

Adding to 31151145 its reverse (54115113), we get a palindrome (85266258).

The spelling of 31151145 in words is "thirty-one million, one hundred fifty-one thousand, one hundred forty-five".