195021487 has 4 divisors (see below), whose sum is σ = 200292376. Its totient is φ = 189750600.

The previous prime is 195021479. The next prime is 195021493. The reversal of 195021487 is 784120591.

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

It is a cyclic number.

It is not a de Polignac number, because 195021487 - 2³ = 195021479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 5270851 = 195021487 / (1 + 9 + 5 + 0 + 2 + 1 + 4 + 8 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195021427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2635389 + ... + 2635462.

It is an arithmetic number, because the mean of its divisors is an integer number (50073094).

Almost surely, 2^195021487 is an apocalyptic number.

195021487 is a deficient number, since it is larger than the sum of its proper divisors (5270889).

195021487 is an equidigital number, since it uses as much as digits as its factorization.

195021487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5270888.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 195021487 is about 13965.0093805912. The cubic root of 195021487 is about 579.9102982560.

The spelling of 195021487 in words is "one hundred ninety-five million, twenty-one thousand, four hundred eighty-seven".