253153721 has 8 divisors (see below), whose sum is σ = 263582088. Its totient is φ = 242928000.

The previous prime is 253153717. The next prime is 253153727. The reversal of 253153721 is 127351352.

It can be written as a sum of positive squares in 4 ways, for example, as 62410000 + 190743721 = 7900^2 + 13811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 253153721 - 2² = 253153717 is a prime.

It is a super-2 number, since 2×253153721² = 128173612912291682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253153727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48110 + ... + 53111.

It is an arithmetic number, because the mean of its divisors is an integer number (32947761).

Almost surely, 2^253153721 is an apocalyptic number.

It is an amenable number.

253153721 is a deficient number, since it is larger than the sum of its proper divisors (10428367).

253153721 is a wasteful number, since it uses less digits than its factorization.

253153721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101323.

The product of its digits is 6300, while the sum is 29.

The square root of 253153721 is about 15910.8051650443. The cubic root of 253153721 is about 632.5984232365.

The spelling of 253153721 in words is "two hundred fifty-three million, one hundred fifty-three thousand, seven hundred twenty-one".