51653769 has 16 divisors (see below), whose sum is σ = 73576512. Its totient is φ = 32119808.

The previous prime is 51653743. The next prime is 51653773. The reversal of 51653769 is 96735615.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51653769 - 2⁸ = 51653513 is a prime.

It is a super-2 number, since 2×51653769² = 5336223703810722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51653769.

It is not an unprimeable number, because it can be changed into a prime (51653269) 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, 1282 + ... + 10244.

It is an arithmetic number, because the mean of its divisors is an integer number (4598532).

Almost surely, 2^51653769 is an apocalyptic number.

51653769 is the 3842-nd nonagonal number.

It is an amenable number.

51653769 is a deficient number, since it is larger than the sum of its proper divisors (21922743).

51653769 is a wasteful number, since it uses less digits than its factorization.

51653769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9096.

The product of its digits is 170100, while the sum is 42.

The square root of 51653769 is about 7187.0556558301. The cubic root of 51653769 is about 372.4208657327.

It can be divided in two parts, 516 and 53769, that added together give a triangular number (54285 = T₃₂₉).

The spelling of 51653769 in words is "fifty-one million, six hundred fifty-three thousand, seven hundred sixty-nine".