1987158551 has 8 divisors (see below), whose sum is σ = 2284638720. Its totient is φ = 1693078488.

The previous prime is 1987158499. The next prime is 1987158629. The reversal of 1987158551 is 1558517891.

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

It is a cyclic number.

It is not a de Polignac number, because 1987158551 - 2¹⁴ = 1987142167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1987158551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987154551) 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, 848771 + ... + 851108.

It is an arithmetic number, because the mean of its divisors is an integer number (285579840).

Almost surely, 2^1987158551 is an apocalyptic number.

1987158551 is a deficient number, since it is larger than the sum of its proper divisors (297480169).

1987158551 is a wasteful number, since it uses less digits than its factorization.

1987158551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700053.

The product of its digits is 504000, while the sum is 50.

The square root of 1987158551 is about 44577.5565840031. The cubic root of 1987158551 is about 1257.2187226654.

The spelling of 1987158551 in words is "one billion, nine hundred eighty-seven million, one hundred fifty-eight thousand, five hundred fifty-one".