31421147 has 4 divisors (see below), whose sum is σ = 31505760. Its totient is φ = 31336536.

The previous prime is 31421141. The next prime is 31421153. The reversal of 31421147 is 74112413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74112413 = 31 ⋅2390723.

It is an interprime number because it is at equal distance from previous prime (31421141) and next prime (31421153).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31421147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31421141) 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, 41747 + ... + 42492.

It is an arithmetic number, because the mean of its divisors is an integer number (7876440).

Almost surely, 2^31421147 is an apocalyptic number.

31421147 is a deficient number, since it is larger than the sum of its proper divisors (84613).

31421147 is an equidigital number, since it uses as much as digits as its factorization.

31421147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84612.

The product of its digits is 672, while the sum is 23.

The square root of 31421147 is about 5605.4568948481. The cubic root of 31421147 is about 315.5542338096.

The spelling of 31421147 in words is "thirty-one million, four hundred twenty-one thousand, one hundred forty-seven".