141921991 has 4 divisors (see below), whose sum is σ = 141987672. Its totient is φ = 141856312.

The previous prime is 141921947. The next prime is 141922003. The reversal of 141921991 is 199129141.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199129141 = 181 ⋅1100161.

It is a cyclic number.

It is not a de Polignac number, because 141921991 - 2¹³ = 141913799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 141921991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (141921191) 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, 29485 + ... + 33958.

It is an arithmetic number, because the mean of its divisors is an integer number (35496918).

Almost surely, 2^141921991 is an apocalyptic number.

141921991 is a deficient number, since it is larger than the sum of its proper divisors (65681).

141921991 is an equidigital number, since it uses as much as digits as its factorization.

141921991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65680.

The product of its digits is 5832, while the sum is 37.

The square root of 141921991 is about 11913.1016532220. The cubic root of 141921991 is about 521.6147916765.

The spelling of 141921991 in words is "one hundred forty-one million, nine hundred twenty-one thousand, nine hundred ninety-one".