721430113 has 2 divisors, whose sum is σ = 721430114. Its totient is φ = 721430112.

The previous prime is 721430069. The next prime is 721430131. The reversal of 721430113 is 311034127.

721430113 = 18992² + 18993².

Together with next prime (721430131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360734049 + 360696064 = 18993^2 + 18992^2 .

It is a cyclic number.

It is not a de Polignac number, because 721430113 - 2²⁵ = 687875681 is a prime.

It is a super-2 number, since 2×721430113² = 1040922815886385538, which contains 22 as substring.

It is equal to p_37304212 and since 721430113 and 37304212 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (721430153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360715056 + 360715057.

It is an arithmetic number, because the mean of its divisors is an integer number (360715057).

Almost surely, 2^721430113 is an apocalyptic number.

721430113 is the 18993-rd centered square number.

It is an amenable number.

721430113 is a deficient number, since it is larger than the sum of its proper divisors (1).

721430113 is an equidigital number, since it uses as much as digits as its factorization.

721430113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 721430113 is about 26859.4510926787. The cubic root of 721430113 is about 896.8739749214.

The spelling of 721430113 in words is "seven hundred twenty-one million, four hundred thirty thousand, one hundred thirteen".