36721831 has 4 divisors (see below), whose sum is σ = 36738352. Its totient is φ = 36705312.

The previous prime is 36721799. The next prime is 36721837. The reversal of 36721831 is 13812763.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13812763 = 31 ⋅445573.

It is a cyclic number.

It is not a de Polignac number, because 36721831 - 2⁵ = 36721799 is a prime.

It is a super-2 number, since 2×36721831² = 2696985743985122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 36721793 and 36721802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36721837) 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 3 ways as a sum of consecutive naturals, for example, 4290 + ... + 9583.

It is an arithmetic number, because the mean of its divisors is an integer number (9184588).

Almost surely, 2^36721831 is an apocalyptic number.

36721831 is a deficient number, since it is larger than the sum of its proper divisors (16521).

36721831 is a wasteful number, since it uses less digits than its factorization.

36721831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16520.

The product of its digits is 6048, while the sum is 31.

The square root of 36721831 is about 6059.8540411465. The cubic root of 36721831 is about 332.3850198855.

The spelling of 36721831 in words is "thirty-six million, seven hundred twenty-one thousand, eight hundred thirty-one".