1921129485 has 16 divisors (see below), whose sum is σ = 3353244480. Its totient is φ = 931456640.

The previous prime is 1921129477. The next prime is 1921129499. The reversal of 1921129485 is 5849211291.

It is not a de Polignac number, because 1921129485 - 2³ = 1921129477 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5821440 + ... + 5821769.

It is an arithmetic number, because the mean of its divisors is an integer number (209577780).

Almost surely, 2^1921129485 is an apocalyptic number.

1921129485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921129485 is a deficient number, since it is larger than the sum of its proper divisors (1432114995).

1921129485 is a wasteful number, since it uses less digits than its factorization.

1921129485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11643228.

The product of its digits is 51840, while the sum is 42.

The square root of 1921129485 is about 43830.6911307590. The cubic root of 1921129485 is about 1243.1366749187.

The spelling of 1921129485 in words is "one billion, nine hundred twenty-one million, one hundred twenty-nine thousand, four hundred eighty-five".