36999999991 has 4 divisors (see below), whose sum is σ = 37011137832. Its totient is φ = 36988862152.

The previous prime is 36999999983. The next prime is 37000000007. The reversal of 36999999991 is 19999999963.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 36999999991 - 2³ = 36999999983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36999999901) 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, 5563936 + ... + 5570581.

It is an arithmetic number, because the mean of its divisors is an integer number (9252784458).

Almost surely, 2^36999999991 is an apocalyptic number.

36999999991 is a deficient number, since it is larger than the sum of its proper divisors (11137841).

36999999991 is a wasteful number, since it uses less digits than its factorization.

36999999991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137840.

The product of its digits is 774840978, while the sum is 82.

Adding to 36999999991 its sum of digits (82), we get a palindrome (37000000073).

The spelling of 36999999991 in words is "thirty-six billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".