1631674909 has 16 divisors (see below), whose sum is σ = 1798853616. Its totient is φ = 1473638400.

The previous prime is 1631674883. The next prime is 1631674973. The reversal of 1631674909 is 9094761361.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 857611225 + 774063684 = 29285^2 + 27822^2 .

It is not a de Polignac number, because 1631674909 - 2²¹ = 1629577757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631674309) 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, 23329 + ... + 61705.

It is an arithmetic number, because the mean of its divisors is an integer number (112428351).

Almost surely, 2^1631674909 is an apocalyptic number.

It is an amenable number.

1631674909 is a deficient number, since it is larger than the sum of its proper divisors (167178707).

1631674909 is a wasteful number, since it uses less digits than its factorization.

1631674909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38496.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 1631674909 is about 40393.9959523690. The cubic root of 1631674909 is about 1177.2748827595.

The spelling of 1631674909 in words is "one billion, six hundred thirty-one million, six hundred seventy-four thousand, nine hundred nine".