1620130261 has 2 divisors, whose sum is σ = 1620130262. Its totient is φ = 1620130260.

The previous prime is 1620130249. The next prime is 1620130271. The reversal of 1620130261 is 1620310261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 967583236 + 652547025 = 31106^2 + 25545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620130261 - 2⁵ = 1620130229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620130231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810065130 + 810065131.

It is an arithmetic number, because the mean of its divisors is an integer number (810065131).

Almost surely, 2^1620130261 is an apocalyptic number.

It is an amenable number.

1620130261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620130261 is an equidigital number, since it uses as much as digits as its factorization.

1620130261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1620130261 is about 40250.8417427512. The cubic root of 1620130261 is about 1174.4917701844.

The spelling of 1620130261 in words is "one billion, six hundred twenty million, one hundred thirty thousand, two hundred sixty-one".