90519090781 has 16 divisors (see below), whose sum is σ = 107988108160. Its totient is φ = 74253257280.

The previous prime is 90519090763. The next prime is 90519090799. The reversal of 90519090781 is 18709091509.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90519090763) and next prime (90519090799).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90519090781 is a prime.

It is a super-2 number, since 2×90519090781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90519090481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2848911 + ... + 2880508.

It is an arithmetic number, because the mean of its divisors is an integer number (6749256760).

Almost surely, 2^90519090781 is an apocalyptic number.

It is an amenable number.

90519090781 is a deficient number, since it is larger than the sum of its proper divisors (17469017379).

90519090781 is a wasteful number, since it uses less digits than its factorization.

90519090781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5729524.

The product of its (nonzero) digits is 204120, while the sum is 49.

The spelling of 90519090781 in words is "ninety billion, five hundred nineteen million, ninety thousand, seven hundred eighty-one".