2157442551 has 48 divisors (see below), whose sum is σ = 3584176128. Its totient is φ = 1238356800.

The previous prime is 2157442543. The next prime is 2157442561. The reversal of 2157442551 is 1552447512.

It is not a de Polignac number, because 2157442551 - 2³ = 2157442543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157442531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 136765 + ... + 151721.

It is an arithmetic number, because the mean of its divisors is an integer number (74670336).

Almost surely, 2^2157442551 is an apocalyptic number.

2157442551 is a deficient number, since it is larger than the sum of its proper divisors (1426733577).

2157442551 is a wasteful number, since it uses less digits than its factorization.

2157442551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15052 (or 15049 counting only the distinct ones).

The product of its digits is 56000, while the sum is 36.

The square root of 2157442551 is about 46448.2782350433. The cubic root of 2157442551 is about 1292.1504406081.

The spelling of 2157442551 in words is "two billion, one hundred fifty-seven million, four hundred forty-two thousand, five hundred fifty-one".