1521913 has 2 divisors, whose sum is σ = 1521914. Its totient is φ = 1521912.

The previous prime is 1521901. The next prime is 1521937. The reversal of 1521913 is 3191251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1505529 + 16384 = 1227^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1521913 - 2¹⁷ = 1390841 is a prime.

1521913 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1521973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760956 + 760957.

It is an arithmetic number, because the mean of its divisors is an integer number (760957).

2^1521913 is an apocalyptic number.

It is an amenable number.

1521913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521913 is an equidigital number, since it uses as much as digits as its factorization.

1521913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 22.

The square root of 1521913 is about 1233.6583805900. The cubic root of 1521913 is about 115.0261566211.

The spelling of 1521913 in words is "one million, five hundred twenty-one thousand, nine hundred thirteen".