1321630061 has 2 divisors, whose sum is σ = 1321630062. Its totient is φ = 1321630060.

The previous prime is 1321630019. The next prime is 1321630073. The reversal of 1321630061 is 1600361231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828345961 + 493284100 = 28781^2 + 22210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321630061 - 2²⁶ = 1254521197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321630001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660815030 + 660815031.

It is an arithmetic number, because the mean of its divisors is an integer number (660815031).

Almost surely, 2^1321630061 is an apocalyptic number.

It is an amenable number.

1321630061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321630061 is an equidigital number, since it uses as much as digits as its factorization.

1321630061 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 23.

The square root of 1321630061 is about 36354.2303040513. The cubic root of 1321630061 is about 1097.4126686459.

Adding to 1321630061 its reverse (1600361231), we get a palindrome (2921991292).

The spelling of 1321630061 in words is "one billion, three hundred twenty-one million, six hundred thirty thousand, sixty-one".