36630991 has 4 divisors (see below), whose sum is σ = 36919552. Its totient is φ = 36342432.

The previous prime is 36630967. The next prime is 36631027. The reversal of 36630991 is 19903663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19903663 = 13 ⋅1531051.

It is a cyclic number.

It is not a de Polignac number, because 36630991 - 2⁹ = 36630479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 36630991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36630941) 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, 144090 + ... + 144343.

It is an arithmetic number, because the mean of its divisors is an integer number (9229888).

Almost surely, 2^36630991 is an apocalyptic number.

36630991 is a deficient number, since it is larger than the sum of its proper divisors (288561).

36630991 is a wasteful number, since it uses less digits than its factorization.

36630991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288560.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 36630991 is about 6052.3541700730. The cubic root of 36630991 is about 332.1107163279.

The spelling of 36630991 in words is "thirty-six million, six hundred thirty thousand, nine hundred ninety-one".