1631265009 has 12 divisors (see below), whose sum is σ = 2390725008. Its totient is φ = 988645240.

The previous prime is 1631264959. The next prime is 1631265017. The reversal of 1631265009 is 9005621361.

It is a happy number.

It is not a de Polignac number, because 1631265009 - 2¹¹ = 1631262961 is a prime.

It is a super-2 number, since 2×1631265009² = 5322051059175540162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1631265019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2246559 + ... + 2247284.

It is an arithmetic number, because the mean of its divisors is an integer number (199227084).

Almost surely, 2^1631265009 is an apocalyptic number.

It is an amenable number.

1631265009 is a deficient number, since it is larger than the sum of its proper divisors (759459999).

1631265009 is a wasteful number, since it uses less digits than its factorization.

1631265009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493868 (or 4493857 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 1631265009 is about 40388.9218598368. The cubic root of 1631265009 is about 1177.1762917582.

The spelling of 1631265009 in words is "one billion, six hundred thirty-one million, two hundred sixty-five thousand, nine".