2501801491 has 4 divisors (see below), whose sum is σ = 2859201712. Its totient is φ = 2144401272.

The previous prime is 2501801461. The next prime is 2501801503. The reversal of 2501801491 is 1941081052.

It is a happy number.

2501801491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2501801491 - 2⁷ = 2501801363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2501801441) 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, 178700100 + ... + 178700113.

It is an arithmetic number, because the mean of its divisors is an integer number (714800428).

Almost surely, 2^2501801491 is an apocalyptic number.

2501801491 is a deficient number, since it is larger than the sum of its proper divisors (357400221).

2501801491 is an equidigital number, since it uses as much as digits as its factorization.

2501801491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357400220.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 2501801491 is about 50018.0116657990. The cubic root of 2501801491 is about 1357.5347299511.

The spelling of 2501801491 in words is "two billion, five hundred one million, eight hundred one thousand, four hundred ninety-one".