1365520421 has 2 divisors, whose sum is σ = 1365520422. Its totient is φ = 1365520420.

The previous prime is 1365520417. The next prime is 1365520433. The reversal of 1365520421 is 1240255631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 894847396 + 470673025 = 29914^2 + 21695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365520421 - 2² = 1365520417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1365520921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682760210 + 682760211.

It is an arithmetic number, because the mean of its divisors is an integer number (682760211).

Almost surely, 2^1365520421 is an apocalyptic number.

It is an amenable number.

1365520421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365520421 is an equidigital number, since it uses as much as digits as its factorization.

1365520421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1365520421 is about 36952.9487456685. The cubic root of 1365520421 is about 1109.4287082651.

The spelling of 1365520421 in words is "one billion, three hundred sixty-five million, five hundred twenty thousand, four hundred twenty-one".