36631993 has 4 divisors (see below), whose sum is σ = 36994788. Its totient is φ = 36269200.

The previous prime is 36631949. The next prime is 36631997. The reversal of 36631993 is 39913663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39913663 = 1663 ⋅24001.

It can be written as a sum of positive squares in 2 ways, for example, as 36036009 + 595984 = 6003^2 + 772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36631993 is a prime.

It is a super-2 number, since 2×36631993² = 2683805822304098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36631997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181246 + ... + 181447.

It is an arithmetic number, because the mean of its divisors is an integer number (9248697).

Almost surely, 2^36631993 is an apocalyptic number.

It is an amenable number.

36631993 is a deficient number, since it is larger than the sum of its proper divisors (362795).

36631993 is a wasteful number, since it uses less digits than its factorization.

36631993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362794.

The product of its digits is 78732, while the sum is 40.

The square root of 36631993 is about 6052.4369472139. The cubic root of 36631993 is about 332.1137444733.

The spelling of 36631993 in words is "thirty-six million, six hundred thirty-one thousand, nine hundred ninety-three".