1919725054521 has 16 divisors (see below), whose sum is σ = 2629038334464. Its totient is φ = 1245120177024.

The previous prime is 1919725054493. The next prime is 1919725054523. The reversal of 1919725054521 is 1254505279191.

It is a happy number.

It is not a de Polignac number, because 1919725054521 - 2¹⁹ = 1919724530233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1919725054523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567085 + ... + 2039861.

It is an arithmetic number, because the mean of its divisors is an integer number (164314895904).

Almost surely, 2^{1919725054521} is an apocalyptic number.

It is an amenable number.

1919725054521 is a deficient number, since it is larger than the sum of its proper divisors (709313279943).

1919725054521 is a wasteful number, since it uses less digits than its factorization.

1919725054521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484560.

The product of its (nonzero) digits is 1134000, while the sum is 51.

The spelling of 1919725054521 in words is "one trillion, nine hundred nineteen billion, seven hundred twenty-five million, fifty-four thousand, five hundred twenty-one".