36321631 has 2 divisors, whose sum is σ = 36321632. Its totient is φ = 36321630.

The previous prime is 36321629. The next prime is 36321643. The reversal of 36321631 is 13612363.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 36321631 - 2¹ = 36321629 is a prime.

It is a super-2 number, since 2×36321631² = 2638521757000322, which contains 22 as substring.

Together with 36321629, it forms a pair of twin primes.

It is equal to p_2222755 and since 36321631 and 2222755 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 36321596 and 36321605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36321031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18160815 + 18160816.

It is an arithmetic number, because the mean of its divisors is an integer number (18160816).

Almost surely, 2^36321631 is an apocalyptic number.

36321631 is a deficient number, since it is larger than the sum of its proper divisors (1).

36321631 is an equidigital number, since it uses as much as digits as its factorization.

36321631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

The square root of 36321631 is about 6026.7429843988. The cubic root of 36321631 is about 331.1731462383.

Adding to 36321631 its reverse (13612363), we get a palindrome (49933994).

The spelling of 36321631 in words is "thirty-six million, three hundred twenty-one thousand, six hundred thirty-one".