51136623 has 8 divisors (see below), whose sum is σ = 75758000. Its totient is φ = 34091064.

The previous prime is 51136609. The next prime is 51136633. The reversal of 51136623 is 32663115.

51136623 is a `hidden beast` number, since 5 + 1 + 1 + 36 + 623 = 666.

It is not a de Polignac number, because 51136623 - 2⁴ = 51136607 is a prime.

It is a super-2 number, since 2×51136623² = 5229908423688258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1893949 = 51136623 / (5 + 1 + 1 + 3 + 6 + 6 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51136633) 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, 946948 + ... + 947001.

It is an arithmetic number, because the mean of its divisors is an integer number (9469750).

Almost surely, 2^51136623 is an apocalyptic number.

51136623 is a deficient number, since it is larger than the sum of its proper divisors (24621377).

51136623 is a wasteful number, since it uses less digits than its factorization.

51136623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893958 (or 1893952 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 51136623 is about 7150.9875541774. The cubic root of 51136623 is about 371.1738298991.

Adding to 51136623 its reverse (32663115), we get a palindrome (83799738).

The spelling of 51136623 in words is "fifty-one million, one hundred thirty-six thousand, six hundred twenty-three".