945194228521 has 9 divisors (see below), whose sum is σ = 997579055511. Its totient is φ = 895429664064.

The previous prime is 945194228507. The next prime is 945194228567. The reversal of 945194228521 is 125822491549.

The square root of 945194228521 is 972211.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 67075302121 + 878118926400 = 258989^2 + 937080^2 .

It is not a de Polignac number, because 945194228521 - 2¹⁹ = 945193704233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (945194220521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18446425 + ... + 18497593.

It is an arithmetic number, because the mean of its divisors is an integer number (110842117279).

Almost surely, 2^945194228521 is an apocalyptic number.

945194228521 is the 972211-st square number.

945194228521 is the 486106-th centered octagonal number.

It is an amenable number.

945194228521 is a deficient number, since it is larger than the sum of its proper divisors (52384826990).

945194228521 is an frugal number, since it uses more digits than its factorization.

945194228521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102376 (or 51188 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 52.

The spelling of 945194228521 in words is "nine hundred forty-five billion, one hundred ninety-four million, two hundred twenty-eight thousand, five hundred twenty-one".