1087556649 has 4 divisors (see below), whose sum is σ = 1450075536. Its totient is φ = 725037764.

The previous prime is 1087556647. The next prime is 1087556669. The reversal of 1087556649 is 9466557801.

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 1087556649 - 2¹ = 1087556647 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1087556647) 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, 181259439 + ... + 181259444.

It is an arithmetic number, because the mean of its divisors is an integer number (362518884).

Almost surely, 2^1087556649 is an apocalyptic number.

It is an amenable number.

1087556649 is a deficient number, since it is larger than the sum of its proper divisors (362518887).

1087556649 is an equidigital number, since it uses as much as digits as its factorization.

1087556649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362518886.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The square root of 1087556649 is about 32978.1237944186. The cubic root of 1087556649 is about 1028.3729138192.

The spelling of 1087556649 in words is "one billion, eighty-seven million, five hundred fifty-six thousand, six hundred forty-nine".