51913636 has 6 divisors (see below), whose sum is σ = 90848870. Its totient is φ = 25956816.

The previous prime is 51913633. The next prime is 51913639. The reversal of 51913636 is 63631915.

It is an interprime number because it is at equal distance from previous prime (51913633) and next prime (51913639).

It can be written as a sum of positive squares in only one way, i.e., 51753636 + 160000 = 7194^2 + 400^2 .

It is not an unprimeable number, because it can be changed into a prime (51913633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6489201 + ... + 6489208.

Almost surely, 2^51913636 is an apocalyptic number.

It is an amenable number.

51913636 is a deficient number, since it is larger than the sum of its proper divisors (38935234).

51913636 is a wasteful number, since it uses less digits than its factorization.

51913636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12978413 (or 12978411 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 51913636 is about 7205.1117964956. Note that the first 3 decimals coincide. The cubic root of 51913636 is about 373.0443636184.

The spelling of 51913636 in words is "fifty-one million, nine hundred thirteen thousand, six hundred thirty-six".