2403187561 has 4 divisors (see below), whose sum is σ = 2432141712. Its totient is φ = 2374233412.

The previous prime is 2403187531. The next prime is 2403187603. The reversal of 2403187561 is 1657813042.

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 2403187561 - 2²⁵ = 2369633129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2403187561.

It is not an unprimeable number, because it can be changed into a prime (2403187531) 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, 14476951 + ... + 14477116.

It is an arithmetic number, because the mean of its divisors is an integer number (608035428).

Almost surely, 2^2403187561 is an apocalyptic number.

It is an amenable number.

2403187561 is a deficient number, since it is larger than the sum of its proper divisors (28954151).

2403187561 is an equidigital number, since it uses as much as digits as its factorization.

2403187561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28954150.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 2403187561 is about 49022.3169689071. The cubic root of 2403187561 is about 1339.4583763769.

The spelling of 2403187561 in words is "two billion, four hundred three million, one hundred eighty-seven thousand, five hundred sixty-one".