31402471 has 2 divisors, whose sum is σ = 31402472. Its totient is φ = 31402470.

The previous prime is 31402409. The next prime is 31402477. The reversal of 31402471 is 17420413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31402471 - 2¹⁷ = 31271399 is a prime.

It is a super-3 number, since 3×31402471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31402477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15701235 + 15701236.

It is an arithmetic number, because the mean of its divisors is an integer number (15701236).

Almost surely, 2^31402471 is an apocalyptic number.

31402471 is a deficient number, since it is larger than the sum of its proper divisors (1).

31402471 is an equidigital number, since it uses as much as digits as its factorization.

31402471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 31402471 is about 5603.7907705410. The cubic root of 31402471 is about 315.4917020496.

Adding to 31402471 its reverse (17420413), we get a palindrome (48822884).

The spelling of 31402471 in words is "thirty-one million, four hundred two thousand, four hundred seventy-one".