253564771 has 4 divisors (see below), whose sum is σ = 255561472. Its totient is φ = 251568072.

The previous prime is 253564769. The next prime is 253564789. The reversal of 253564771 is 177465352.

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

It is a cyclic number.

It is not a de Polignac number, because 253564771 - 2¹ = 253564769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253564711) 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, 998160 + ... + 998413.

It is an arithmetic number, because the mean of its divisors is an integer number (63890368).

Almost surely, 2^253564771 is an apocalyptic number.

253564771 is a deficient number, since it is larger than the sum of its proper divisors (1996701).

253564771 is a wasteful number, since it uses less digits than its factorization.

253564771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996700.

The product of its digits is 176400, while the sum is 40.

The square root of 253564771 is about 15923.7172481805. The cubic root of 253564771 is about 632.9406250280.

The spelling of 253564771 in words is "two hundred fifty-three million, five hundred sixty-four thousand, seven hundred seventy-one".