2541631657 has 4 divisors (see below), whose sum is σ = 2542510080. Its totient is φ = 2540753236.

The previous prime is 2541631637. The next prime is 2541631663. The reversal of 2541631657 is 7561361452.

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 2541631657 - 2¹¹ = 2541629609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2541631607) 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, 434857 + ... + 440662.

It is an arithmetic number, because the mean of its divisors is an integer number (635627520).

Almost surely, 2^2541631657 is an apocalyptic number.

It is an amenable number.

2541631657 is a deficient number, since it is larger than the sum of its proper divisors (878423).

2541631657 is an equidigital number, since it uses as much as digits as its factorization.

2541631657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878422.

The product of its digits is 151200, while the sum is 40.

The square root of 2541631657 is about 50414.5976578213. The cubic root of 2541631657 is about 1364.7010856873.

The spelling of 2541631657 in words is "two billion, five hundred forty-one million, six hundred thirty-one thousand, six hundred fifty-seven".