921025819 has 16 divisors (see below), whose sum is σ = 1090022400. Its totient is φ = 761441184.

The previous prime is 921025801. The next prime is 921025871. The reversal of 921025819 is 918520129.

It is not a de Polignac number, because 921025819 - 2²¹ = 918928667 is a prime.

It is a super-2 number, since 2×921025819² = 1696577118529241522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921025879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275842 + ... + 279160.

It is an arithmetic number, because the mean of its divisors is an integer number (68126400).

Almost surely, 2^921025819 is an apocalyptic number.

921025819 is a deficient number, since it is larger than the sum of its proper divisors (168996581).

921025819 is a wasteful number, since it uses less digits than its factorization.

921025819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 921025819 is about 30348.4071904935. The cubic root of 921025819 is about 972.9501774898.

The spelling of 921025819 in words is "nine hundred twenty-one million, twenty-five thousand, eight hundred nineteen".