1915480912081 has 27 divisors (see below), whose sum is σ = 2151999690267. Its totient is φ = 1703659718640.

The previous prime is 1915480912061. The next prime is 1915480912087. The reversal of 1915480912081 is 1802190845191.

The square root of 1915480912081 is 1384009.

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., 35609577025 + 1879871335056 = 188705^2 + 1371084^2 .

It is not a de Polignac number, because 1915480912081 - 2²³ = 1915472523473 is a prime.

It is a super-2 number, since 2×1915480912081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1915480912087) 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, 715531315 + ... + 715533991.

Almost surely, 2^{1915480912081} is an apocalyptic number.

1915480912081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1915480912081 is the 1384009-th square number.

1915480912081 is the 692005-th centered octagonal number.

It is an amenable number.

1915480912081 is a deficient number, since it is larger than the sum of its proper divisors (236518778186).

1915480912081 is an frugal number, since it uses more digits than its factorization.

1915480912081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470 (or 2735 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 49.

Multiplying 1915480912081 by its sum of digits (49), we get a square (93858564691969 = 9688063²).

The spelling of 1915480912081 in words is "one trillion, nine hundred fifteen billion, four hundred eighty million, nine hundred twelve thousand, eighty-one".