1825764991 has 2 divisors, whose sum is σ = 1825764992. Its totient is φ = 1825764990.

The previous prime is 1825764959. The next prime is 1825765013. The reversal of 1825764991 is 1994675281.

It is a strong prime.

It is an emirp because it is prime and its reverse (1994675281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1825764991 - 2⁵ = 1825764959 is a prime.

It is a super-4 number, since 4×1825764991⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1825764901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 912882495 + 912882496.

It is an arithmetic number, because the mean of its divisors is an integer number (912882496).

Almost surely, 2^1825764991 is an apocalyptic number.

1825764991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1825764991 is an equidigital number, since it uses as much as digits as its factorization.

1825764991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 52.

The square root of 1825764991 is about 42728.9713309366. The cubic root of 1825764991 is about 1222.2169202216.

The spelling of 1825764991 in words is "one billion, eight hundred twenty-five million, seven hundred sixty-four thousand, nine hundred ninety-one".