1919090645 has 32 divisors (see below), whose sum is σ = 2509056000. Its totient is φ = 1403458560.

The previous prime is 1919090617. The next prime is 1919090651. The reversal of 1919090645 is 5460909191.

It is not a de Polignac number, because 1919090645 - 2¹⁶ = 1919025109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1919090596 and 1919090605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 696731 + ... + 699479.

It is an arithmetic number, because the mean of its divisors is an integer number (78408000).

Almost surely, 2^1919090645 is an apocalyptic number.

It is an amenable number.

1919090645 is a deficient number, since it is larger than the sum of its proper divisors (589965355).

1919090645 is a wasteful number, since it uses less digits than its factorization.

1919090645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 1919090645 is about 43807.4268246835. The cubic root of 1919090645 is about 1242.6967507414.

The spelling of 1919090645 in words is "one billion, nine hundred nineteen million, ninety thousand, six hundred forty-five".