90388061 has 2 divisors, whose sum is σ = 90388062. Its totient is φ = 90388060.

The previous prime is 90388057. The next prime is 90388069. The reversal of 90388061 is 16088309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90364036 + 24025 = 9506^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 90388061 - 2² = 90388057 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 (90388069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45194030 + 45194031.

It is an arithmetic number, because the mean of its divisors is an integer number (45194031).

Almost surely, 2^90388061 is an apocalyptic number.

It is an amenable number.

90388061 is a deficient number, since it is larger than the sum of its proper divisors (1).

90388061 is an equidigital number, since it uses as much as digits as its factorization.

90388061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 90388061 is about 9507.2635915914. The cubic root of 90388061 is about 448.7836468384.

The spelling of 90388061 in words is "ninety million, three hundred eighty-eight thousand, sixty-one".