1921582145 has 16 divisors (see below), whose sum is σ = 2637713280. Its totient is φ = 1316456064.

The previous prime is 1921582133. The next prime is 1921582147. The reversal of 1921582145 is 5412851291.

It is not a de Polignac number, because 1921582145 - 2⁴ = 1921582129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1921582099 and 1921582108.

It is not an unprimeable number, because it can be changed into a prime (1921582147) 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, 14861 + ... + 63749.

It is an arithmetic number, because the mean of its divisors is an integer number (164857080).

Almost surely, 2^1921582145 is an apocalyptic number.

It is an amenable number.

1921582145 is a deficient number, since it is larger than the sum of its proper divisors (716131135).

1921582145 is a wasteful number, since it uses less digits than its factorization.

1921582145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50024.

The product of its digits is 28800, while the sum is 38.

The square root of 1921582145 is about 43835.8545599376. The cubic root of 1921582145 is about 1243.2343039544.

The spelling of 1921582145 in words is "one billion, nine hundred twenty-one million, five hundred eighty-two thousand, one hundred forty-five".