31432861 has 2 divisors, whose sum is σ = 31432862. Its totient is φ = 31432860.

The previous prime is 31432837. The next prime is 31432879. The reversal of 31432861 is 16823413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31427236 + 5625 = 5606^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 31432861 - 2⁵ = 31432829 is a prime.

It is a super-3 number, since 3×31432861³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31432831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15716430 + 15716431.

It is an arithmetic number, because the mean of its divisors is an integer number (15716431).

Almost surely, 2^31432861 is an apocalyptic number.

It is an amenable number.

31432861 is a deficient number, since it is larger than the sum of its proper divisors (1).

31432861 is an equidigital number, since it uses as much as digits as its factorization.

31432861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 31432861 is about 5606.5016721660. The cubic root of 31432861 is about 315.5934424678.

The spelling of 31432861 in words is "thirty-one million, four hundred thirty-two thousand, eight hundred sixty-one".