1945919521 has 16 divisors (see below), whose sum is σ = 2445940224. Its totient is φ = 1506867264.

The previous prime is 1945919509. The next prime is 1945919537. The reversal of 1945919521 is 1259195491.

It is not a de Polignac number, because 1945919521 - 2⁵ = 1945919489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1945919021) 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, 223210 + ... + 231763.

It is an arithmetic number, because the mean of its divisors is an integer number (152871264).

Almost surely, 2^1945919521 is an apocalyptic number.

It is an amenable number.

1945919521 is a deficient number, since it is larger than the sum of its proper divisors (500020703).

1945919521 is a wasteful number, since it uses less digits than its factorization.

1945919521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455040.

The product of its digits is 145800, while the sum is 46.

The square root of 1945919521 is about 44112.5778095092. The cubic root of 1945919521 is about 1248.4609369523.

The spelling of 1945919521 in words is "one billion, nine hundred forty-five million, nine hundred nineteen thousand, five hundred twenty-one".