103121987 has 4 divisors (see below), whose sum is σ = 108549480. Its totient is φ = 97694496.

The previous prime is 103121971. The next prime is 103121989. The reversal of 103121987 is 789121301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789121301 = 41 ⋅19246861.

It is a cyclic number.

It is not a de Polignac number, because 103121987 - 2⁴ = 103121971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103121989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2713718 + ... + 2713755.

It is an arithmetic number, because the mean of its divisors is an integer number (27137370).

Almost surely, 2^103121987 is an apocalyptic number.

103121987 is a deficient number, since it is larger than the sum of its proper divisors (5427493).

103121987 is an equidigital number, since it uses as much as digits as its factorization.

103121987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5427492.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 103121987 is about 10154.8996548464. The cubic root of 103121987 is about 468.9397967528.

The spelling of 103121987 in words is "one hundred three million, one hundred twenty-one thousand, nine hundred eighty-seven".