1725720131 has 2 divisors, whose sum is σ = 1725720132. Its totient is φ = 1725720130.

The previous prime is 1725720127. The next prime is 1725720149. The reversal of 1725720131 is 1310275271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1725720131 - 2² = 1725720127 is a prime.

It is a super-2 number, since 2×1725720131² = 5956219941077314322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1725720094 and 1725720103.

It is not a weakly prime, because it can be changed into another prime (1725720151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862860065 + 862860066.

It is an arithmetic number, because the mean of its divisors is an integer number (862860066).

Almost surely, 2^1725720131 is an apocalyptic number.

1725720131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1725720131 is an equidigital number, since it uses as much as digits as its factorization.

1725720131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 1725720131 is about 41541.7877684627. The cubic root of 1725720131 is about 1199.4720202782.

The spelling of 1725720131 in words is "one billion, seven hundred twenty-five million, seven hundred twenty thousand, one hundred thirty-one".