36630721 has 2 divisors, whose sum is σ = 36630722. Its totient is φ = 36630720.

The previous prime is 36630677. The next prime is 36630731. The reversal of 36630721 is 12703663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 15800625 = 4564^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 36630721 - 2¹³ = 36622529 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 36630721.

It is not a weakly prime, because it can be changed into another prime (36630731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18315360 + 18315361.

It is an arithmetic number, because the mean of its divisors is an integer number (18315361).

Almost surely, 2^36630721 is an apocalyptic number.

It is an amenable number.

36630721 is a deficient number, since it is larger than the sum of its proper divisors (1).

36630721 is an equidigital number, since it uses as much as digits as its factorization.

36630721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 36630721 is about 6052.3318646618. The cubic root of 36630721 is about 332.1099003511.

The spelling of 36630721 in words is "thirty-six million, six hundred thirty thousand, seven hundred twenty-one".