188249531 has 2 divisors, whose sum is σ = 188249532. Its totient is φ = 188249530.

The previous prime is 188249519. The next prime is 188249533. The reversal of 188249531 is 135942881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188249531 is a prime.

It is a super-2 number, since 2×188249531² = 70875771843439922, which contains 22 as substring.

Together with 188249533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188249533) 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, 94124765 + 94124766.

It is an arithmetic number, because the mean of its divisors is an integer number (94124766).

Almost surely, 2^188249531 is an apocalyptic number.

188249531 is a deficient number, since it is larger than the sum of its proper divisors (1).

188249531 is an equidigital number, since it uses as much as digits as its factorization.

188249531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 188249531 is about 13720.4056426915. The cubic root of 188249531 is about 573.1187728857.

The spelling of 188249531 in words is "one hundred eighty-eight million, two hundred forty-nine thousand, five hundred thirty-one".