53605981 has 16 divisors (see below), whose sum is σ = 66685248. Its totient is φ = 42336000.

The previous prime is 53605969. The next prime is 53605987. The reversal of 53605981 is 18950635.

It is a cyclic number.

It is not a de Polignac number, because 53605981 - 2²³ = 45217373 is a prime.

It is a super-2 number, since 2×53605981² = 5747202397944722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53605981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53605987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8595 + ... + 13456.

It is an arithmetic number, because the mean of its divisors is an integer number (4167828).

Almost surely, 2^53605981 is an apocalyptic number.

It is an amenable number.

53605981 is a deficient number, since it is larger than the sum of its proper divisors (13079267).

53605981 is a wasteful number, since it uses less digits than its factorization.

53605981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22092.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 53605981 is about 7321.6105468674. The cubic root of 53605981 is about 377.0547498156.

The spelling of 53605981 in words is "fifty-three million, six hundred five thousand, nine hundred eighty-one".