53861551 has 4 divisors (see below), whose sum is σ = 53878104. Its totient is φ = 53845000.

The previous prime is 53861543. The next prime is 53861569. The reversal of 53861551 is 15516835.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53861551 - 2³ = 53861543 is a prime.

It is a super-2 number, since 2×53861551² = 5802133352251202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53861531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1600 + ... + 10501.

It is an arithmetic number, because the mean of its divisors is an integer number (13469526).

Almost surely, 2^53861551 is an apocalyptic number.

53861551 is a deficient number, since it is larger than the sum of its proper divisors (16553).

53861551 is a wasteful number, since it uses less digits than its factorization.

53861551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16552.

The product of its digits is 18000, while the sum is 34.

The square root of 53861551 is about 7339.0429212534. The cubic root of 53861551 is about 377.6530110829.

The spelling of 53861551 in words is "fifty-three million, eight hundred sixty-one thousand, five hundred fifty-one".