1921063845 has 32 divisors (see below), whose sum is σ = 3235790592. Its totient is φ = 971328512.

The previous prime is 1921063787. The next prime is 1921063847. The reversal of 1921063845 is 5483601291.

It is a cyclic number.

It is not a de Polignac number, because 1921063845 - 2⁸ = 1921063589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921063847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14347 + ... + 63623.

It is an arithmetic number, because the mean of its divisors is an integer number (101118456).

Almost surely, 2^1921063845 is an apocalyptic number.

1921063845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921063845 is a deficient number, since it is larger than the sum of its proper divisors (1314726747).

1921063845 is a wasteful number, since it uses less digits than its factorization.

1921063845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49421.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1921063845 is about 43829.9423339799. The cubic root of 1921063845 is about 1243.1225165081.

The spelling of 1921063845 in words is "one billion, nine hundred twenty-one million, sixty-three thousand, eight hundred forty-five".