53699781 has 16 divisors (see below), whose sum is σ = 74654208. Its totient is φ = 34296000.

The previous prime is 53699773. The next prime is 53699827. The reversal of 53699781 is 18799635.

53699781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 53699781 - 2³ = 53699773 is a prime.

It is a super-2 number, since 2×53699781² = 5767332958895922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 53699781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53699761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6535 + ... + 12251.

It is an arithmetic number, because the mean of its divisors is an integer number (4665888).

Almost surely, 2^53699781 is an apocalyptic number.

It is an amenable number.

53699781 is a deficient number, since it is larger than the sum of its proper divisors (20954427).

53699781 is a wasteful number, since it uses less digits than its factorization.

53699781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5852.

The product of its digits is 408240, while the sum is 48.

The square root of 53699781 is about 7328.0134415816. The cubic root of 53699781 is about 377.2745457291.

The spelling of 53699781 in words is "fifty-three million, six hundred ninety-nine thousand, seven hundred eighty-one".