360721721 has 2 divisors, whose sum is σ = 360721722. Its totient is φ = 360721720.

The previous prime is 360721703. The next prime is 360721727. The reversal of 360721721 is 127127063.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311875600 + 48846121 = 17660^2 + 6989^2 .

It is a cyclic number.

It is not a de Polignac number, because 360721721 - 2²⁶ = 293612857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (360721727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180360860 + 180360861.

It is an arithmetic number, because the mean of its divisors is an integer number (180360861).

Almost surely, 2^360721721 is an apocalyptic number.

It is an amenable number.

360721721 is a deficient number, since it is larger than the sum of its proper divisors (1).

360721721 is an equidigital number, since it uses as much as digits as its factorization.

360721721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 360721721 is about 18992.6754566069. The cubic root of 360721721 is about 711.8537296055.

Adding to 360721721 its reverse (127127063), we get a palindrome (487848784).

The spelling of 360721721 in words is "three hundred sixty million, seven hundred twenty-one thousand, seven hundred twenty-one".