90621388619 has 2 divisors, whose sum is σ = 90621388620. Its totient is φ = 90621388618.

The previous prime is 90621388609. The next prime is 90621388633. The reversal of 90621388619 is 91688312609.

It is a weak prime.

It is an emirp because it is prime and its reverse (91688312609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90621388619 - 2³² = 86326421323 is a prime.

It is a super-2 number, since 2×90621388619² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90621388609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45310694309 + 45310694310.

It is an arithmetic number, because the mean of its divisors is an integer number (45310694310).

Almost surely, 2^90621388619 is an apocalyptic number.

90621388619 is a deficient number, since it is larger than the sum of its proper divisors (1).

90621388619 is an equidigital number, since it uses as much as digits as its factorization.

90621388619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 90621388619 in words is "ninety billion, six hundred twenty-one million, three hundred eighty-eight thousand, six hundred nineteen".