31970071 has 4 divisors (see below), whose sum is σ = 36537232. Its totient is φ = 27402912.

The previous prime is 31970063. The next prime is 31970101. The reversal of 31970071 is 17007913.

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: 17007913 = 13 ⋅1308301.

It is a cyclic number.

It is not a de Polignac number, because 31970071 - 2³ = 31970063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31970041) 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, 2283570 + ... + 2283583.

It is an arithmetic number, because the mean of its divisors is an integer number (9134308).

Almost surely, 2^31970071 is an apocalyptic number.

31970071 is a deficient number, since it is larger than the sum of its proper divisors (4567161).

31970071 is an equidigital number, since it uses as much as digits as its factorization.

31970071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567160.

The product of its (nonzero) digits is 1323, while the sum is 28.

The square root of 31970071 is about 5654.2082558038. The cubic root of 31970071 is about 317.3812017576.

Adding to 31970071 its reverse (17007913), we get a palindrome (48977984).

The spelling of 31970071 in words is "thirty-one million, nine hundred seventy thousand, seventy-one".