90699551 has 2 divisors, whose sum is σ = 90699552. Its totient is φ = 90699550.

The previous prime is 90699547. The next prime is 90699569. The reversal of 90699551 is 15599609.

It is a weak prime.

It is an emirp because it is prime and its reverse (15599609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90699551 - 2² = 90699547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90699541) 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, 45349775 + 45349776.

It is an arithmetic number, because the mean of its divisors is an integer number (45349776).

Almost surely, 2^90699551 is an apocalyptic number.

90699551 is a deficient number, since it is larger than the sum of its proper divisors (1).

90699551 is an equidigital number, since it uses as much as digits as its factorization.

90699551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 90699551 is about 9523.6311877351. The cubic root of 90699551 is about 449.2985796839.

The spelling of 90699551 in words is "ninety million, six hundred ninety-nine thousand, five hundred fifty-one".