31536145 has 8 divisors (see below), whose sum is σ = 39064320. Its totient is φ = 24414960.

The previous prime is 31536101. The next prime is 31536161. The reversal of 31536145 is 54163513.

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

It is not a de Polignac number, because 31536145 - 2⁷ = 31536017 is a prime.

It is a super-2 number, since 2×31536145² = 1989056882922050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101575 + ... + 101884.

It is an arithmetic number, because the mean of its divisors is an integer number (4883040).

Almost surely, 2^31536145 is an apocalyptic number.

It is an amenable number.

31536145 is a deficient number, since it is larger than the sum of its proper divisors (7528175).

31536145 is a wasteful number, since it uses less digits than its factorization.

31536145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203495.

The product of its digits is 5400, while the sum is 28.

The square root of 31536145 is about 5615.7052094995. The cubic root of 31536145 is about 315.9387299091.

Adding to 31536145 its reverse (54163513), we get a palindrome (85699658).

It can be divided in two parts, 31 and 536145, that multiplied together give a triangular number (16620495 = T₅₇₆₅).

The spelling of 31536145 in words is "thirty-one million, five hundred thirty-six thousand, one hundred forty-five".