1915325261 has 4 divisors (see below), whose sum is σ = 1915412832. Its totient is φ = 1915237692.

The previous prime is 1915325249. The next prime is 1915325287. The reversal of 1915325261 is 1625235191.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1915325261 - 2³⁰ = 841583437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1915325231) 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, 19880 + ... + 65006.

It is an arithmetic number, because the mean of its divisors is an integer number (478853208).

Almost surely, 2^1915325261 is an apocalyptic number.

It is an amenable number.

1915325261 is a deficient number, since it is larger than the sum of its proper divisors (87571).

1915325261 is an equidigital number, since it uses as much as digits as its factorization.

1915325261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87570.

The product of its digits is 16200, while the sum is 35.

The square root of 1915325261 is about 43764.4291748447. The cubic root of 1915325261 is about 1241.8834672668.

The spelling of 1915325261 in words is "one billion, nine hundred fifteen million, three hundred twenty-five thousand, two hundred sixty-one".