1551128871 has 4 divisors (see below), whose sum is σ = 2068171832. Its totient is φ = 1034085912.

The previous prime is 1551128861. The next prime is 1551128879. The reversal of 1551128871 is 1788211551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1551128871 - 2⁷ = 1551128743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551128879) 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, 258521476 + ... + 258521481.

It is an arithmetic number, because the mean of its divisors is an integer number (517042958).

Almost surely, 2^1551128871 is an apocalyptic number.

1551128871 is a deficient number, since it is larger than the sum of its proper divisors (517042961).

1551128871 is an equidigital number, since it uses as much as digits as its factorization.

1551128871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517042960.

The product of its digits is 22400, while the sum is 39.

The square root of 1551128871 is about 39384.3734366817. The cubic root of 1551128871 is about 1157.5754131119.

The spelling of 1551128871 in words is "one billion, five hundred fifty-one million, one hundred twenty-eight thousand, eight hundred seventy-one".