253721525 has 12 divisors (see below), whose sum is σ = 316702944. Its totient is φ = 201630000.

The previous prime is 253721519. The next prime is 253721537. The reversal of 253721525 is 525127352.

It is not a de Polignac number, because 253721525 - 2¹⁴ = 253705141 is a prime.

It is a super-2 number, since 2×253721525² = 128749224496651250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253721491 and 253721500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29831 + ... + 37380.

It is an arithmetic number, because the mean of its divisors is an integer number (26391912).

Almost surely, 2^253721525 is an apocalyptic number.

253721525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

253721525 is a deficient number, since it is larger than the sum of its proper divisors (62981419).

253721525 is a wasteful number, since it uses less digits than its factorization.

253721525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67372 (or 67367 counting only the distinct ones).

The product of its digits is 21000, while the sum is 32.

The square root of 253721525 is about 15928.6385168350. The cubic root of 253721525 is about 633.0710263402.

Adding to 253721525 its reverse (525127352), we get a palindrome (778848877).

The spelling of 253721525 in words is "two hundred fifty-three million, seven hundred twenty-one thousand, five hundred twenty-five".