90947477 has 2 divisors, whose sum is σ = 90947478. Its totient is φ = 90947476.

The previous prime is 90947473. The next prime is 90947489. The reversal of 90947477 is 77474909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46977316 + 43970161 = 6854^2 + 6631^2 .

It is an emirp because it is prime and its reverse (77474909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90947477 - 2² = 90947473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90947473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45473738 + 45473739.

It is an arithmetic number, because the mean of its divisors is an integer number (45473739).

Almost surely, 2^90947477 is an apocalyptic number.

It is an amenable number.

90947477 is a deficient number, since it is larger than the sum of its proper divisors (1).

90947477 is an equidigital number, since it uses as much as digits as its factorization.

90947477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 90947477 is about 9536.6386635963. The cubic root of 90947477 is about 449.7075911045.

The spelling of 90947477 in words is "ninety million, nine hundred forty-seven thousand, four hundred seventy-seven".