1501921 has 2 divisors, whose sum is σ = 1501922. Its totient is φ = 1501920.

The previous prime is 1501909. The next prime is 1501937. The reversal of 1501921 is 1291051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 1296 = 1225^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 1501921 - 2⁵ = 1501889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1501901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 750960 + 750961.

It is an arithmetic number, because the mean of its divisors is an integer number (750961).

2^1501921 is an apocalyptic number.

It is an amenable number.

1501921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1501921 is an equidigital number, since it uses as much as digits as its factorization.

1501921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 1501921 is about 1225.5288654291. The cubic root of 1501921 is about 114.5202699887.

Adding to 1501921 its reverse (1291051), we get a palindrome (2792972).

The spelling of 1501921 in words is "one million, five hundred one thousand, nine hundred twenty-one".