90671782451 has 2 divisors, whose sum is σ = 90671782452. Its totient is φ = 90671782450.

The previous prime is 90671782393. The next prime is 90671782459. The reversal of 90671782451 is 15428717609.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90671782451 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90671782451.

It is not a weakly prime, because it can be changed into another prime (90671782459) 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, 45335891225 + 45335891226.

It is an arithmetic number, because the mean of its divisors is an integer number (45335891226).

Almost surely, 2^90671782451 is an apocalyptic number.

90671782451 is a deficient number, since it is larger than the sum of its proper divisors (1).

90671782451 is an equidigital number, since it uses as much as digits as its factorization.

90671782451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 90671782451 in words is "ninety billion, six hundred seventy-one million, seven hundred eighty-two thousand, four hundred fifty-one".