191148621 has 4 divisors (see below), whose sum is σ = 254864832. Its totient is φ = 127432412.

The previous prime is 191148619. The next prime is 191148649. The reversal of 191148621 is 126841191.

191148621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191148621 - 2¹ = 191148619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191148611) 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, 31858101 + ... + 31858106.

It is an arithmetic number, because the mean of its divisors is an integer number (63716208).

Almost surely, 2^191148621 is an apocalyptic number.

It is an amenable number.

191148621 is a deficient number, since it is larger than the sum of its proper divisors (63716211).

191148621 is an equidigital number, since it uses as much as digits as its factorization.

191148621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63716210.

The product of its digits is 3456, while the sum is 33.

The square root of 191148621 is about 13825.6508345900. The cubic root of 191148621 is about 576.0458556038.

The spelling of 191148621 in words is "one hundred ninety-one million, one hundred forty-eight thousand, six hundred twenty-one".