36699981 has 4 divisors (see below), whose sum is σ = 48933312. Its totient is φ = 24466652.

The previous prime is 36699937. The next prime is 36699983. The reversal of 36699981 is 18999663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18999663 = 3 ⋅6333221.

It is a cyclic number.

It is not a de Polignac number, because 36699981 - 2¹¹ = 36697933 is a prime.

It is a super-2 number, since 2×36699981² = 2693777210800722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36699983) 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, 6116661 + ... + 6116666.

It is an arithmetic number, because the mean of its divisors is an integer number (12233328).

Almost surely, 2^36699981 is an apocalyptic number.

It is an amenable number.

36699981 is a deficient number, since it is larger than the sum of its proper divisors (12233331).

36699981 is a wasteful number, since it uses less digits than its factorization.

36699981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12233330.

The product of its digits is 629856, while the sum is 51.

The square root of 36699981 is about 6058.0509241835. The cubic root of 36699981 is about 332.3190822365.

The spelling of 36699981 in words is "thirty-six million, six hundred ninety-nine thousand, nine hundred eighty-one".