1153021987 has 8 divisors (see below), whose sum is σ = 1242914400. Its totient is φ = 1063300800.

The previous prime is 1153021981. The next prime is 1153021997. The reversal of 1153021987 is 7891203511.

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-1153021987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1153021981) 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, 28639 + ... + 55912.

It is an arithmetic number, because the mean of its divisors is an integer number (155364300).

Almost surely, 2^1153021987 is an apocalyptic number.

1153021987 is a deficient number, since it is larger than the sum of its proper divisors (89892413).

1153021987 is a wasteful number, since it uses less digits than its factorization.

1153021987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85613.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 1153021987 is about 33956.1774497660. The cubic root of 1153021987 is about 1048.6064618498.

The spelling of 1153021987 in words is "one billion, one hundred fifty-three million, twenty-one thousand, nine hundred eighty-seven".