2487661991 has 8 divisors (see below), whose sum is σ = 2679558144. Its totient is φ = 2302743960.

The previous prime is 2487661951. The next prime is 2487661993. The reversal of 2487661991 is 1991667842.

2487661991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2487661991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2487661993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1743791 + ... + 1745216.

It is an arithmetic number, because the mean of its divisors is an integer number (334944768).

Almost surely, 2^2487661991 is an apocalyptic number.

2487661991 is a deficient number, since it is larger than the sum of its proper divisors (191896153).

2487661991 is a wasteful number, since it uses less digits than its factorization.

2487661991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489061.

The product of its digits is 1306368, while the sum is 53.

The square root of 2487661991 is about 49876.4673067370. The cubic root of 2487661991 is about 1354.9724246509.

The spelling of 2487661991 in words is "two billion, four hundred eighty-seven million, six hundred sixty-one thousand, nine hundred ninety-one".