31350881 has 2 divisors, whose sum is σ = 31350882. Its totient is φ = 31350880.

The previous prime is 31350871. The next prime is 31350883. The reversal of 31350881 is 18805313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 10784656 = 4535^2 + 3284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31350881 is a prime.

It is a super-2 number, since 2×31350881² = 1965755478952322, which contains 22 as substring.

Together with 31350883, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1936262 and since 31350881 and 1936262 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31350883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15675440 + 15675441.

It is an arithmetic number, because the mean of its divisors is an integer number (15675441).

Almost surely, 2^31350881 is an apocalyptic number.

It is an amenable number.

31350881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31350881 is an equidigital number, since it uses as much as digits as its factorization.

31350881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 31350881 is about 5599.1857443739. The cubic root of 31350881 is about 315.3188373276.

The spelling of 31350881 in words is "thirty-one million, three hundred fifty thousand, eight hundred eighty-one".