253555397 has 4 divisors (see below), whose sum is σ = 253599180. Its totient is φ = 253511616.

The previous prime is 253555369. The next prime is 253555411. The reversal of 253555397 is 793555352.

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 132687361 + 120868036 = 11519^2 + 10994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253555397 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 (253555097) 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, 11588 + ... + 25325.

It is an arithmetic number, because the mean of its divisors is an integer number (63399795).

Almost surely, 2^253555397 is an apocalyptic number.

It is an amenable number.

253555397 is a deficient number, since it is larger than the sum of its proper divisors (43783).

253555397 is an equidigital number, since it uses as much as digits as its factorization.

253555397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43782.

The product of its digits is 708750, while the sum is 44.

The square root of 253555397 is about 15923.4229046396. The cubic root of 253555397 is about 632.9328252345.

The spelling of 253555397 in words is "two hundred fifty-three million, five hundred fifty-five thousand, three hundred ninety-seven".