31243147 has 4 divisors (see below), whose sum is σ = 33646480. Its totient is φ = 28839816.

The previous prime is 31243141. The next prime is 31243151. The reversal of 31243147 is 74134213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74134213 = 1193 ⋅62141.

It is a cyclic number.

It is not a de Polignac number, because 31243147 - 2³ = 31243139 is a prime.

It is a super-2 number, since 2×31243147² = 1952268468927218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31243141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201647 + ... + 1201672.

It is an arithmetic number, because the mean of its divisors is an integer number (8411620).

Almost surely, 2^31243147 is an apocalyptic number.

31243147 is a deficient number, since it is larger than the sum of its proper divisors (2403333).

31243147 is a wasteful number, since it uses less digits than its factorization.

31243147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403332.

The product of its digits is 2016, while the sum is 25.

The square root of 31243147 is about 5589.5569591874. The cubic root of 31243147 is about 314.9572361532.

The spelling of 31243147 in words is "thirty-one million, two hundred forty-three thousand, one hundred forty-seven".