2631901009 has 4 divisors (see below), whose sum is σ = 2632046400. Its totient is φ = 2631755620.

The previous prime is 2631901007. The next prime is 2631901031. The reversal of 2631901009 is 9001091362.

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.

It is a cyclic number.

It is not a de Polignac number, because 2631901009 - 2¹ = 2631901007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2631901007) 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, 40909 + ... + 83290.

It is an arithmetic number, because the mean of its divisors is an integer number (658011600).

Almost surely, 2^2631901009 is an apocalyptic number.

It is an amenable number.

2631901009 is a deficient number, since it is larger than the sum of its proper divisors (145391).

2631901009 is a wasteful number, since it uses less digits than its factorization.

2631901009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145390.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 2631901009 is about 51302.0565767105. The cubic root of 2631901009 is about 1380.6698786891.

The spelling of 2631901009 in words is "two billion, six hundred thirty-one million, nine hundred one thousand, nine".