103531991 has 2 divisors, whose sum is σ = 103531992. Its totient is φ = 103531990.

The previous prime is 103531973. The next prime is 103532041. The reversal of 103531991 is 199135301.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 103531991 - 2⁶ = 103531927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103531591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51765995 + 51765996.

It is an arithmetic number, because the mean of its divisors is an integer number (51765996).

Almost surely, 2^103531991 is an apocalyptic number.

103531991 is a deficient number, since it is larger than the sum of its proper divisors (1).

103531991 is an equidigital number, since it uses as much as digits as its factorization.

103531991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 103531991 is about 10175.0671250857. The cubic root of 103531991 is about 469.5604627778.

The spelling of 103531991 in words is "one hundred three million, five hundred thirty-one thousand, nine hundred ninety-one".