31361145 has 16 divisors (see below), whose sum is σ = 50269632. Its totient is φ = 16695360.

The previous prime is 31361123. The next prime is 31361171. The reversal of 31361145 is 54116313.

It is not a de Polignac number, because 31361145 - 2¹³ = 31352953 is a prime.

It is a super-2 number, since 2×31361145² = 1967042831422050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8334 + ... + 11496.

It is an arithmetic number, because the mean of its divisors is an integer number (3141852).

Almost surely, 2^31361145 is an apocalyptic number.

It is an amenable number.

31361145 is a deficient number, since it is larger than the sum of its proper divisors (18908487).

31361145 is a wasteful number, since it uses less digits than its factorization.

31361145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832.

The product of its digits is 1080, while the sum is 24.

The square root of 31361145 is about 5600.1022312097. The cubic root of 31361145 is about 315.3532444353.

Adding to 31361145 its reverse (54116313), we get a palindrome (85477458).

The spelling of 31361145 in words is "thirty-one million, three hundred sixty-one thousand, one hundred forty-five".