36489991 has 2 divisors, whose sum is σ = 36489992. Its totient is φ = 36489990.

The previous prime is 36489967. The next prime is 36490019. The reversal of 36489991 is 19998463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 36489991 - 2¹³ = 36481799 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36489961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18244995 + 18244996.

It is an arithmetic number, because the mean of its divisors is an integer number (18244996).

Almost surely, 2^36489991 is an apocalyptic number.

36489991 is a deficient number, since it is larger than the sum of its proper divisors (1).

36489991 is an equidigital number, since it uses as much as digits as its factorization.

36489991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 36489991 is about 6040.6945792682. The cubic root of 36489991 is about 331.6840482573.

The spelling of 36489991 in words is "thirty-six million, four hundred eighty-nine thousand, nine hundred ninety-one".