1503661 has 2 divisors, whose sum is σ = 1503662. Its totient is φ = 1503660.

The previous prime is 1503659. The next prime is 1503683. The reversal of 1503661 is 1663051.

It is an a-pointer prime, because the next prime (1503683) can be obtained adding 1503661 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1394761 + 108900 = 1181^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1503661 - 2¹ = 1503659 is a prime.

Together with 1503659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1503611) 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, 751830 + 751831.

It is an arithmetic number, because the mean of its divisors is an integer number (751831).

2^1503661 is an apocalyptic number.

It is an amenable number.

1503661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1503661 is an equidigital number, since it uses as much as digits as its factorization.

1503661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1503661 is about 1226.2385575409. The cubic root of 1503661 is about 114.5644774556.

The spelling of 1503661 in words is "one million, five hundred three thousand, six hundred sixty-one".