1781225003 has 4 divisors (see below), whose sum is σ = 1781417568. Its totient is φ = 1781032440.

The previous prime is 1781224993. The next prime is 1781225009. The reversal of 1781225003 is 3005221871.

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

It is a cyclic number.

It is not a de Polignac number, because 1781225003 - 2²⁰ = 1780176427 is a prime.

It is a super-2 number, since 2×1781225003² = 6345525022624700018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1781225009) 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, 81668 + ... + 101153.

It is an arithmetic number, because the mean of its divisors is an integer number (445354392).

Almost surely, 2^1781225003 is an apocalyptic number.

1781225003 is a deficient number, since it is larger than the sum of its proper divisors (192565).

1781225003 is an equidigital number, since it uses as much as digits as its factorization.

1781225003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192564.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1781225003 is about 42204.5614003984. The cubic root of 1781225003 is about 1212.1962259940.

Adding to 1781225003 its reverse (3005221871), we get a palindrome (4786446874).

The spelling of 1781225003 in words is "one billion, seven hundred eighty-one million, two hundred twenty-five thousand, three".