1521641 has 8 divisors (see below), whose sum is σ = 1699104. Its totient is φ = 1350720.

The previous prime is 1521629. The next prime is 1521643. The reversal of 1521641 is 1461251.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1521641 is a prime.

It is a pancake number, because a pancake can be divided into 1521641 parts by 1744 straight cuts.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1521643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1136 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (212388).

2^1521641 is an apocalyptic number.

1521641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1521641 is a deficient number, since it is larger than the sum of its proper divisors (177463).

1521641 is a wasteful number, since it uses less digits than its factorization.

1521641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271.

The product of its digits is 240, while the sum is 20.

The square root of 1521641 is about 1233.5481344479. The cubic root of 1521641 is about 115.0193036279.

Adding to 1521641 its reverse (1461251), we get a palindrome (2982892).

The spelling of 1521641 in words is "one million, five hundred twenty-one thousand, six hundred forty-one".