65131636 has 6 divisors (see below), whose sum is σ = 113980370. Its totient is φ = 32565816.

The previous prime is 65131631. The next prime is 65131643. The reversal of 65131636 is 63613156.

It can be written as a sum of positive squares in only one way, i.e., 52128400 + 13003236 = 7220^2 + 3606^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65131598 and 65131607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65131631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8141451 + ... + 8141458.

Almost surely, 2^65131636 is an apocalyptic number.

It is an amenable number.

65131636 is a deficient number, since it is larger than the sum of its proper divisors (48848734).

65131636 is a wasteful number, since it uses less digits than its factorization.

65131636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16282913 (or 16282911 counting only the distinct ones).

The product of its digits is 9720, while the sum is 31.

The square root of 65131636 is about 8070.4173374120. The cubic root of 65131636 is about 402.3438145096.

The spelling of 65131636 in words is "sixty-five million, one hundred thirty-one thousand, six hundred thirty-six".