130549721 has 2 divisors, whose sum is σ = 130549722. Its totient is φ = 130549720.

The previous prime is 130549717. The next prime is 130549723. The reversal of 130549721 is 127945031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75255625 + 55294096 = 8675^2 + 7436^2 .

It is a cyclic number.

It is not a de Polignac number, because 130549721 - 2² = 130549717 is a prime.

Together with 130549723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (130549723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65274860 + 65274861.

It is an arithmetic number, because the mean of its divisors is an integer number (65274861).

Almost surely, 2^130549721 is an apocalyptic number.

It is an amenable number.

130549721 is a deficient number, since it is larger than the sum of its proper divisors (1).

130549721 is an equidigital number, since it uses as much as digits as its factorization.

130549721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 130549721 is about 11425.8356805968. The cubic root of 130549721 is about 507.2927426649.

The spelling of 130549721 in words is "one hundred thirty million, five hundred forty-nine thousand, seven hundred twenty-one".