36971621 has 4 divisors (see below), whose sum is σ = 37970892. Its totient is φ = 35972352.

The previous prime is 36971609. The next prime is 36971633. The reversal of 36971621 is 12617963.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12617963 = 43 ⋅293441.

It is an interprime number because it is at equal distance from previous prime (36971609) and next prime (36971633).

It can be written as a sum of positive squares in 2 ways, for example, as 18395521 + 18576100 = 4289^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 36971621 - 2²² = 32777317 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 (36971681) 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, 499580 + ... + 499653.

It is an arithmetic number, because the mean of its divisors is an integer number (9492723).

Almost surely, 2^36971621 is an apocalyptic number.

It is an amenable number.

36971621 is a deficient number, since it is larger than the sum of its proper divisors (999271).

36971621 is an equidigital number, since it uses as much as digits as its factorization.

36971621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999270.

The product of its digits is 13608, while the sum is 35.

The square root of 36971621 is about 6080.4293433934. The cubic root of 36971621 is about 333.1369695688.

The spelling of 36971621 in words is "thirty-six million, nine hundred seventy-one thousand, six hundred twenty-one".