265721051 has 2 divisors, whose sum is σ = 265721052. Its totient is φ = 265721050.

The previous prime is 265721017. The next prime is 265721081. The reversal of 265721051 is 150127562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265721051 - 2¹⁰ = 265720027 is a prime.

It is not a weakly prime, because it can be changed into another prime (265721081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132860525 + 132860526.

It is an arithmetic number, because the mean of its divisors is an integer number (132860526).

Almost surely, 2^265721051 is an apocalyptic number.

265721051 is a deficient number, since it is larger than the sum of its proper divisors (1).

265721051 is an equidigital number, since it uses as much as digits as its factorization.

265721051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 265721051 is about 16300.9524568352. The cubic root of 265721051 is about 642.8978704191.

The spelling of 265721051 in words is "two hundred sixty-five million, seven hundred twenty-one thousand, fifty-one".