1081721503 has 2 divisors, whose sum is σ = 1081721504. Its totient is φ = 1081721502.

The previous prime is 1081721453. The next prime is 1081721507. The reversal of 1081721503 is 3051271801.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081721503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081721507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540860751 + 540860752.

It is an arithmetic number, because the mean of its divisors is an integer number (540860752).

Almost surely, 2^1081721503 is an apocalyptic number.

1081721503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081721503 is an equidigital number, since it uses as much as digits as its factorization.

1081721503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 1081721503 is about 32889.5348553305. The cubic root of 1081721503 is about 1026.5304135653.

The spelling of 1081721503 in words is "one billion, eighty-one million, seven hundred twenty-one thousand, five hundred three".