36897991 has 16 divisors (see below), whose sum is σ = 41827968. Its totient is φ = 32313600.

The previous prime is 36897989. The next prime is 36897997. The reversal of 36897991 is 19979863.

It is a cyclic number.

It is not a de Polignac number, because 36897991 - 2¹ = 36897989 is a prime.

It is a super-2 number, since 2×36897991² = 2722923479672162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36897997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18786 + ... + 20656.

It is an arithmetic number, because the mean of its divisors is an integer number (2614248).

Almost surely, 2^36897991 is an apocalyptic number.

36897991 is a deficient number, since it is larger than the sum of its proper divisors (4929977).

36897991 is a wasteful number, since it uses less digits than its factorization.

36897991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its digits is 734832, while the sum is 52.

The square root of 36897991 is about 6074.3716547475. The cubic root of 36897991 is about 332.9156721181.

The spelling of 36897991 in words is "thirty-six million, eight hundred ninety-seven thousand, nine hundred ninety-one".