20131567451 has 4 divisors (see below), whose sum is σ = 20135305752. Its totient is φ = 20127829152.

The previous prime is 20131567381. The next prime is 20131567543. The reversal of 20131567451 is 15476513102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20131567451 - 2³⁰ = 19057825627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131867451) 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, 1861061 + ... + 1871846.

It is an arithmetic number, because the mean of its divisors is an integer number (5033826438).

Almost surely, 2^20131567451 is an apocalyptic number.

20131567451 is a deficient number, since it is larger than the sum of its proper divisors (3738301).

20131567451 is an equidigital number, since it uses as much as digits as its factorization.

20131567451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738300.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 20131567451 in words is "twenty billion, one hundred thirty-one million, five hundred sixty-seven thousand, four hundred fifty-one".