1915261 has 4 divisors (see below), whose sum is σ = 1951452. Its totient is φ = 1879072.

The previous prime is 1915259. The next prime is 1915267. The reversal of 1915261 is 1625191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1625191 = 101 ⋅16091.

It can be written as a sum of positive squares in 2 ways, for example, as 1265625 + 649636 = 1125^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 1915261 - 2¹ = 1915259 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 (1915267) 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, 18016 + ... + 18121.

It is an arithmetic number, because the mean of its divisors is an integer number (487863).

2^1915261 is an apocalyptic number.

It is an amenable number.

1915261 is a deficient number, since it is larger than the sum of its proper divisors (36191).

1915261 is an equidigital number, since it uses as much as digits as its factorization.

1915261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36190.

The product of its digits is 540, while the sum is 25.

The square root of 1915261 is about 1383.9295502301. The cubic root of 1915261 is about 124.1869578318.

The spelling of 1915261 in words is "one million, nine hundred fifteen thousand, two hundred sixty-one".