1825661317 has 4 divisors (see below), whose sum is σ = 1905037920. Its totient is φ = 1746284716.

The previous prime is 1825661311. The next prime is 1825661371. The reversal of 1825661317 is 7131665281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1825661317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1825661317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1825661311) 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, 39688267 + ... + 39688312.

It is an arithmetic number, because the mean of its divisors is an integer number (476259480).

Almost surely, 2^1825661317 is an apocalyptic number.

It is an amenable number.

1825661317 is a deficient number, since it is larger than the sum of its proper divisors (79376603).

1825661317 is an equidigital number, since it uses as much as digits as its factorization.

1825661317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79376602.

The product of its digits is 60480, while the sum is 40.

The square root of 1825661317 is about 42727.7581555597. The cubic root of 1825661317 is about 1222.1937857152.

The spelling of 1825661317 in words is "one billion, eight hundred twenty-five million, six hundred sixty-one thousand, three hundred seventeen".