1781481325 has 24 divisors (see below), whose sum is σ = 2504180000. Its totient is φ = 1246311360.

The previous prime is 1781481263. The next prime is 1781481343. The reversal of 1781481325 is 5231841871.

It is a de Polignac number, because none of the positive numbers 2^k-1781481325 is a prime.

It is a super-2 number, since 2×1781481325² = 6347351422647511250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138075 + ... + 150424.

Almost surely, 2^1781481325 is an apocalyptic number.

It is an amenable number.

1781481325 is a deficient number, since it is larger than the sum of its proper divisors (722698675).

1781481325 is a wasteful number, since it uses less digits than its factorization.

1781481325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288541 (or 288536 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The square root of 1781481325 is about 42207.5979534491. The cubic root of 1781481325 is about 1212.2543690618.

The spelling of 1781481325 in words is "one billion, seven hundred eighty-one million, four hundred eighty-one thousand, three hundred twenty-five".