1781466225 has 96 divisors (see below), whose sum is σ = 3689763840. Its totient is φ = 736800000.

The previous prime is 1781466223. The next prime is 1781466229. The reversal of 1781466225 is 5226641871.

It is a happy number.

It is not a de Polignac number, because 1781466225 - 2¹ = 1781466223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1781466223) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1448911 + ... + 1450139.

It is an arithmetic number, because the mean of its divisors is an integer number (38435040).

Almost surely, 2^1781466225 is an apocalyptic number.

1781466225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1781466225 is an abundant number, since it is smaller than the sum of its proper divisors (1908297615).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1781466225 is a wasteful number, since it uses less digits than its factorization.

1781466225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511 (or 1506 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 1781466225 is about 42207.4190753237. The cubic root of 1781466225 is about 1212.2509439921.

The spelling of 1781466225 in words is "one billion, seven hundred eighty-one million, four hundred sixty-six thousand, two hundred twenty-five".