31420071 has 6 divisors (see below), whose sum is σ = 45384560. Its totient is φ = 20946708.

The previous prime is 31420069. The next prime is 31420099. The reversal of 31420071 is 17002413.

It is not a de Polignac number, because 31420071 - 2¹ = 31420069 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 (31425071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1745551 + ... + 1745568.

Almost surely, 2^31420071 is an apocalyptic number.

31420071 is a deficient number, since it is larger than the sum of its proper divisors (13964489).

31420071 is a wasteful number, since it uses less digits than its factorization.

31420071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491125 (or 3491122 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 31420071 is about 5605.3609161231. The cubic root of 31420071 is about 315.5506317744.

Adding to 31420071 its reverse (17002413), we get a palindrome (48422484).

The spelling of 31420071 in words is "thirty-one million, four hundred twenty thousand, seventy-one".