103151991 has 4 divisors (see below), whose sum is σ = 137535992. Its totient is φ = 68767992.

The previous prime is 103151963. The next prime is 103152013. The reversal of 103151991 is 199151301.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 103151991 - 2¹⁷ = 103020919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103151921) 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 in 3 ways as a sum of consecutive naturals, for example, 17191996 + ... + 17192001.

It is an arithmetic number, because the mean of its divisors is an integer number (34383998).

Almost surely, 2^103151991 is an apocalyptic number.

103151991 is a deficient number, since it is larger than the sum of its proper divisors (34384001).

103151991 is an equidigital number, since it uses as much as digits as its factorization.

103151991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34384000.

The product of its (nonzero) digits is 1215, while the sum is 30.

The square root of 103151991 is about 10156.3768638230. The cubic root of 103151991 is about 468.9852726845.

The spelling of 103151991 in words is "one hundred three million, one hundred fifty-one thousand, nine hundred ninety-one".