2157550393 has 4 divisors (see below), whose sum is σ = 2284465140. Its totient is φ = 2030635648.

The previous prime is 2157550379. The next prime is 2157550403. The reversal of 2157550393 is 3930557512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 735657129 + 1421893264 = 27123^2 + 37708^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157550393 - 2⁵ = 2157550361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157550693) 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, 63457348 + ... + 63457381.

It is an arithmetic number, because the mean of its divisors is an integer number (571116285).

Almost surely, 2^2157550393 is an apocalyptic number.

It is an amenable number.

2157550393 is a deficient number, since it is larger than the sum of its proper divisors (126914747).

2157550393 is a wasteful number, since it uses less digits than its factorization.

2157550393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126914746.

The product of its (nonzero) digits is 141750, while the sum is 40.

The square root of 2157550393 is about 46449.4391031797. The cubic root of 2157550393 is about 1292.1719700753.

The spelling of 2157550393 in words is "two billion, one hundred fifty-seven million, five hundred fifty thousand, three hundred ninety-three".