691200061 has 2 divisors, whose sum is σ = 691200062. Its totient is φ = 691200060.

The previous prime is 691200043. The next prime is 691200079. The reversal of 691200061 is 160002196.

It is a balanced prime because it is at equal distance from previous prime (691200043) and next prime (691200079).

It can be written as a sum of positive squares in only one way, i.e., 565535961 + 125664100 = 23781^2 + 11210^2 .

It is a cyclic number.

It is not a de Polignac number, because 691200061 - 2¹³ = 691191869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691199999 and 691200035.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691200011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345600030 + 345600031.

It is an arithmetic number, because the mean of its divisors is an integer number (345600031).

Almost surely, 2^691200061 is an apocalyptic number.

It is an amenable number.

691200061 is a deficient number, since it is larger than the sum of its proper divisors (1).

691200061 is an equidigital number, since it uses as much as digits as its factorization.

691200061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 691200061 is about 26290.6839203548. The cubic root of 691200061 is about 884.1675856836.

The spelling of 691200061 in words is "six hundred ninety-one million, two hundred thousand, sixty-one".