1520881 has 4 divisors (see below), whose sum is σ = 1525732. Its totient is φ = 1516032.

The previous prime is 1520879. The next prime is 1520887. The reversal of 1520881 is 1880251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1880251 = 17 ⋅110603.

It can be written as a sum of positive squares in 2 ways, for example, as 119025 + 1401856 = 345^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1520881 - 2¹ = 1520879 is a prime.

It is a super-2 number, since 2×1520881² = 4626158032322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520887) 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, 1920 + ... + 2593.

It is an arithmetic number, because the mean of its divisors is an integer number (381433).

2^1520881 is an apocalyptic number.

It is an amenable number.

1520881 is a deficient number, since it is larger than the sum of its proper divisors (4851).

1520881 is an equidigital number, since it uses as much as digits as its factorization.

1520881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1520881 is about 1233.2400415167. The cubic root of 1520881 is about 115.0001512285. Note that the first 3 decimals are identical.

It can be divided in two parts, 1520 and 881, that added together give a 4-th power (2401 = 7⁴).

The spelling of 1520881 in words is "one million, five hundred twenty thousand, eight hundred eighty-one".