1921588045 has 16 divisors (see below), whose sum is σ = 2485071792. Its totient is φ = 1417996800.

The previous prime is 1921588043. The next prime is 1921588049. The reversal of 1921588045 is 5408851291.

It can be written as a sum of positive squares in 8 ways, for example, as 353665636 + 1567922409 = 18806^2 + 39597^2 .

It is not a de Polignac number, because 1921588045 - 2¹ = 1921588043 is a prime.

It is a super-2 number, since 2×1921588045² = 7385001229373844050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1921587992 and 1921588010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921588043) 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, 87145 + ... + 106945.

It is an arithmetic number, because the mean of its divisors is an integer number (155316987).

Almost surely, 2^1921588045 is an apocalyptic number.

It is an amenable number.

1921588045 is a deficient number, since it is larger than the sum of its proper divisors (563483747).

1921588045 is a wasteful number, since it uses less digits than its factorization.

1921588045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21312.

The product of its (nonzero) digits is 115200, while the sum is 43.

The square root of 1921588045 is about 43835.9218563954. The cubic root of 1921588045 is about 1243.2355763564.

The spelling of 1921588045 in words is "one billion, nine hundred twenty-one million, five hundred eighty-eight thousand, forty-five".