1401585509 has 2 divisors, whose sum is σ = 1401585510. Its totient is φ = 1401585508.

The previous prime is 1401585503. The next prime is 1401585539. The reversal of 1401585509 is 9055851041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1257057025 + 144528484 = 35455^2 + 12022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1401585509 - 2⁸ = 1401585253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1401585503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700792754 + 700792755.

It is an arithmetic number, because the mean of its divisors is an integer number (700792755).

Almost surely, 2^1401585509 is an apocalyptic number.

It is an amenable number.

1401585509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401585509 is an equidigital number, since it uses as much as digits as its factorization.

1401585509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 1401585509 is about 37437.7551276783. The cubic root of 1401585509 is about 1119.1110902325. Note that the first 3 decimals are identical.

The spelling of 1401585509 in words is "one billion, four hundred one million, five hundred eighty-five thousand, five hundred nine".