191428545 has 48 divisors (see below), whose sum is σ = 388698048. Its totient is φ = 79551360.

The previous prime is 191428543. The next prime is 191428547. The reversal of 191428545 is 545824191.

It is an interprime number because it is at equal distance from previous prime (191428543) and next prime (191428547).

It is not a de Polignac number, because 191428545 - 2¹ = 191428543 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191428541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3754 + ... + 19923.

It is an arithmetic number, because the mean of its divisors is an integer number (8097876).

Almost surely, 2^191428545 is an apocalyptic number.

191428545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191428545 is an abundant number, since it is smaller than the sum of its proper divisors (197269503).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191428545 is a wasteful number, since it uses less digits than its factorization.

191428545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23710 (or 23703 counting only the distinct ones).

The product of its digits is 57600, while the sum is 39.

The square root of 191428545 is about 13835.7704881224. The cubic root of 191428545 is about 576.3269116227.

The spelling of 191428545 in words is "one hundred ninety-one million, four hundred twenty-eight thousand, five hundred forty-five".