1921961495 has 4 divisors (see below), whose sum is σ = 2306353800. Its totient is φ = 1537569192.

The previous prime is 1921961477. The next prime is 1921961507. The reversal of 1921961495 is 5941691291.

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 1921961495 - 2¹² = 1921957399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192196145 + ... + 192196154.

It is an arithmetic number, because the mean of its divisors is an integer number (576588450).

Almost surely, 2^1921961495 is an apocalyptic number.

1921961495 is a deficient number, since it is larger than the sum of its proper divisors (384392305).

1921961495 is an equidigital number, since it uses as much as digits as its factorization.

1921961495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384392304.

The product of its digits is 174960, while the sum is 47.

The square root of 1921961495 is about 43840.1812838405. The cubic root of 1921961495 is about 1243.3161097904.

The spelling of 1921961495 in words is "one billion, nine hundred twenty-one million, nine hundred sixty-one thousand, four hundred ninety-five".