1721502131 has 2 divisors, whose sum is σ = 1721502132. Its totient is φ = 1721502130.

The previous prime is 1721502113. The next prime is 1721502151. The reversal of 1721502131 is 1312051271.

Together with previous prime (1721502113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721502131 - 2³⁰ = 647760307 is a prime.

It is a super-2 number, since 2×1721502131² = 5927139174075082322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1721502097 and 1721502106.

It is not a weakly prime, because it can be changed into another prime (1721502151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860751065 + 860751066.

It is an arithmetic number, because the mean of its divisors is an integer number (860751066).

Almost surely, 2^1721502131 is an apocalyptic number.

1721502131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721502131 is an equidigital number, since it uses as much as digits as its factorization.

1721502131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1721502131 is about 41490.9885517325. The cubic root of 1721502131 is about 1198.4939743537.

The spelling of 1721502131 in words is "one billion, seven hundred twenty-one million, five hundred two thousand, one hundred thirty-one".