1913275081 has 27 divisors (see below), whose sum is σ = 2125726023. Its totient is φ = 1721645760.

The previous prime is 1913275027. The next prime is 1913275121. The reversal of 1913275081 is 1805723191.

The square root of 1913275081 is 43741.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1489574025 + 423701056 = 38595^2 + 20584^2 .

It is not a de Polignac number, because 1913275081 - 2¹⁹ = 1912750793 is a prime.

It is a super-2 number, since 2×1913275081² = 7321243071151113122, which contains 22 as substring.

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 1913275081.

It is not an unprimeable number, because it can be changed into a prime (1913275381) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 23051466 + ... + 23051548.

Almost surely, 2^1913275081 is an apocalyptic number.

1913275081 is the 43741-st square number.

1913275081 is the 21871-st centered octagonal number.

It is an amenable number.

1913275081 is a deficient number, since it is larger than the sum of its proper divisors (212450942).

1913275081 is an frugal number, since it uses more digits than its factorization.

1913275081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The cubic root of 1913275081 is about 1241.4402016260.

The spelling of 1913275081 in words is "one billion, nine hundred thirteen million, two hundred seventy-five thousand, eighty-one".