1425721505 has 16 divisors (see below), whose sum is σ = 1851840144. Its totient is φ = 1047486720.

The previous prime is 1425721501. The next prime is 1425721513. The reversal of 1425721505 is 5051275241.

It can be written as a sum of positive squares in 8 ways, for example, as 105925264 + 1319796241 = 10292^2 + 36329^2 .

It is not a de Polignac number, because 1425721505 - 2² = 1425721501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1425721501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42866 + ... + 68475.

It is an arithmetic number, because the mean of its divisors is an integer number (115740009).

Almost surely, 2^1425721505 is an apocalyptic number.

It is an amenable number.

1425721505 is a deficient number, since it is larger than the sum of its proper divisors (426118639).

1425721505 is a wasteful number, since it uses less digits than its factorization.

1425721505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111556.

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 1425721505 is about 37758.7275341741. The cubic root of 1425721505 is about 1125.4984471069.

Adding to 1425721505 its reverse (5051275241), we get a palindrome (6476996746).

The spelling of 1425721505 in words is "one billion, four hundred twenty-five million, seven hundred twenty-one thousand, five hundred five".