53507721 has 8 divisors (see below), whose sum is σ = 75540384. Its totient is φ = 33573440.

The previous prime is 53507719. The next prime is 53507723. The reversal of 53507721 is 12770535.

It is an interprime number because it is at equal distance from previous prime (53507719) and next prime (53507723).

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 53507721 - 2¹ = 53507719 is a prime.

It is a super-2 number, since 2×53507721² = 5726152413227682, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53507723) 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, 524535 + ... + 524636.

It is an arithmetic number, because the mean of its divisors is an integer number (9442548).

Almost surely, 2^53507721 is an apocalyptic number.

53507721 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

53507721 is a deficient number, since it is larger than the sum of its proper divisors (22032663).

53507721 is a wasteful number, since it uses less digits than its factorization.

53507721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049191.

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 53507721 is about 7314.8971968169. The cubic root of 53507721 is about 376.8242279015.

The spelling of 53507721 in words is "fifty-three million, five hundred seven thousand, seven hundred twenty-one".