700721761 has 2 divisors, whose sum is σ = 700721762. Its totient is φ = 700721760.

The previous prime is 700721743. The next prime is 700721797. The reversal of 700721761 is 167127007.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617820736 + 82901025 = 24856^2 + 9105^2 .

It is a cyclic number.

It is not a de Polignac number, because 700721761 - 2⁷ = 700721633 is a prime.

It is a super-2 number, since 2×700721761² = 982021972677882242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (700725761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 350360880 + 350360881.

It is an arithmetic number, because the mean of its divisors is an integer number (350360881).

Almost surely, 2^700721761 is an apocalyptic number.

It is an amenable number.

700721761 is a deficient number, since it is larger than the sum of its proper divisors (1).

700721761 is an equidigital number, since it uses as much as digits as its factorization.

700721761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 700721761 is about 26471.1495972502. The cubic root of 700721761 is about 888.2090657175.

Adding to 700721761 its reverse (167127007), we get a palindrome (867848768).

The spelling of 700721761 in words is "seven hundred million, seven hundred twenty-one thousand, seven hundred sixty-one".