36311921 has 2 divisors, whose sum is σ = 36311922. Its totient is φ = 36311920.

The previous prime is 36311903. The next prime is 36311941. The reversal of 36311921 is 12911363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 790321 = 5960^2 + 889^2 .

It is an emirp because it is prime and its reverse (12911363) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36311921 - 2¹⁸ = 36049777 is a prime.

It is not a weakly prime, because it can be changed into another prime (36311941) 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 as a sum of consecutive naturals, namely, 18155960 + 18155961.

It is an arithmetic number, because the mean of its divisors is an integer number (18155961).

Almost surely, 2^36311921 is an apocalyptic number.

It is an amenable number.

36311921 is a deficient number, since it is larger than the sum of its proper divisors (1).

36311921 is an equidigital number, since it uses as much as digits as its factorization.

36311921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 36311921 is about 6025.9373544703. The cubic root of 36311921 is about 331.1436323485.

The spelling of 36311921 in words is "thirty-six million, three hundred eleven thousand, nine hundred twenty-one".