1521961 has 8 divisors (see below), whose sum is σ = 1782144. Its totient is φ = 1272480.

The previous prime is 1521937. The next prime is 1521973. The reversal of 1521961 is 1691251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1521961 - 2¹¹ = 1519913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2365 + ... + 2938.

It is an arithmetic number, because the mean of its divisors is an integer number (222768).

2^1521961 is an apocalyptic number.

It is an amenable number.

1521961 is a deficient number, since it is larger than the sum of its proper divisors (260183).

1521961 is an equidigital number, since it uses as much as digits as its factorization.

1521961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351.

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

The square root of 1521961 is about 1233.6778347689. The cubic root of 1521961 is about 115.0273658881.

It can be divided in two parts, 1521 and 961, that multiplied together give a square (1461681 = 1209²).

The spelling of 1521961 in words is "one million, five hundred twenty-one thousand, nine hundred sixty-one".