1425599509 has 4 divisors (see below), whose sum is σ = 1436482080. Its totient is φ = 1414716940.

The previous prime is 1425599489. The next prime is 1425599521. The reversal of 1425599509 is 9059955241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9059955241 = 6691 ⋅1354051.

It is a cyclic number.

It is not a de Polignac number, because 1425599509 - 2²⁹ = 888728597 is a prime.

It is a super-2 number, since 2×1425599509² = 4064667920122082162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1425599579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5441089 + ... + 5441350.

It is an arithmetic number, because the mean of its divisors is an integer number (359120520).

Almost surely, 2^1425599509 is an apocalyptic number.

It is an amenable number.

1425599509 is a deficient number, since it is larger than the sum of its proper divisors (10882571).

1425599509 is a wasteful number, since it uses less digits than its factorization.

1425599509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10882570.

The product of its (nonzero) digits is 729000, while the sum is 49.

The square root of 1425599509 is about 37757.1120320397. The cubic root of 1425599509 is about 1125.4663440104.

The spelling of 1425599509 in words is "one billion, four hundred twenty-five million, five hundred ninety-nine thousand, five hundred nine".