2865431521 has 2 divisors, whose sum is σ = 2865431522. Its totient is φ = 2865431520.

The previous prime is 2865431501. The next prime is 2865431537. The reversal of 2865431521 is 1251345682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2781507600 + 83923921 = 52740^2 + 9161^2 .

It is a cyclic number.

It is not a de Polignac number, because 2865431521 - 2⁵ = 2865431489 is a prime.

It is not a weakly prime, because it can be changed into another prime (2865431501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1432715760 + 1432715761.

It is an arithmetic number, because the mean of its divisors is an integer number (1432715761).

Almost surely, 2^2865431521 is an apocalyptic number.

It is an amenable number.

2865431521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2865431521 is an equidigital number, since it uses as much as digits as its factorization.

2865431521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 37.

The square root of 2865431521 is about 53529.7255830814. The cubic root of 2865431521 is about 1420.3542594602.

The spelling of 2865431521 in words is "two billion, eight hundred sixty-five million, four hundred thirty-one thousand, five hundred twenty-one".