1045657121 has 4 divisors (see below), whose sum is σ = 1045802772. Its totient is φ = 1045511472.

The previous prime is 1045657061. The next prime is 1045657159. The reversal of 1045657121 is 1217565401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 544568896 + 501088225 = 23336^2 + 22385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1045657121 - 2⁶ = 1045657057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1045617121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61466 + ... + 76611.

It is an arithmetic number, because the mean of its divisors is an integer number (261450693).

Almost surely, 2^1045657121 is an apocalyptic number.

It is an amenable number.

1045657121 is a deficient number, since it is larger than the sum of its proper divisors (145651).

1045657121 is an equidigital number, since it uses as much as digits as its factorization.

1045657121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145650.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1045657121 is about 32336.6219788029. The cubic root of 1045657121 is about 1014.9931231385.

The spelling of 1045657121 in words is "one billion, forty-five million, six hundred fifty-seven thousand, one hundred twenty-one".