1725851381 has 2 divisors, whose sum is σ = 1725851382. Its totient is φ = 1725851380.

The previous prime is 1725851371. The next prime is 1725851411. The reversal of 1725851381 is 1831585271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1386370756 + 339480625 = 37234^2 + 18425^2 .

It is an emirp because it is prime and its reverse (1831585271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1725851381 - 2⁶ = 1725851317 is a prime.

It is a super-2 number, since 2×1725851381² = 5957125978599214322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1725851341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862925690 + 862925691.

It is an arithmetic number, because the mean of its divisors is an integer number (862925691).

Almost surely, 2^1725851381 is an apocalyptic number.

It is an amenable number.

1725851381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1725851381 is an equidigital number, since it uses as much as digits as its factorization.

1725851381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 41.

The square root of 1725851381 is about 41543.3674730395. The cubic root of 1725851381 is about 1199.5024282045.

The spelling of 1725851381 in words is "one billion, seven hundred twenty-five million, eight hundred fifty-one thousand, three hundred eighty-one".