2130764561 has 2 divisors, whose sum is σ = 2130764562. Its totient is φ = 2130764560.

The previous prime is 2130764549. The next prime is 2130764569. The reversal of 2130764561 is 1654670312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1213825600 + 916938961 = 34840^2 + 30281^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130764561 - 2¹⁴ = 2130748177 is a prime.

It is a super-2 number, since 2×2130764561² = 9080315228827045442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2130764569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065382280 + 1065382281.

It is an arithmetic number, because the mean of its divisors is an integer number (1065382281).

Almost surely, 2^2130764561 is an apocalyptic number.

It is an amenable number.

2130764561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130764561 is an equidigital number, since it uses as much as digits as its factorization.

2130764561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 2130764561 is about 46160.2053829920. The cubic root of 2130764561 is about 1286.8022797796.

The spelling of 2130764561 in words is "two billion, one hundred thirty million, seven hundred sixty-four thousand, five hundred sixty-one".