90750513781 has 4 divisors (see below), whose sum is σ = 90752744992. Its totient is φ = 90748282572.

The previous prime is 90750513757. The next prime is 90750513803. The reversal of 90750513781 is 18731505709.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90750513781 is a prime.

It is a super-2 number, since 2×90750513781² (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 (90750513481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053441 + ... + 1136326.

It is an arithmetic number, because the mean of its divisors is an integer number (22688186248).

Almost surely, 2^90750513781 is an apocalyptic number.

It is an amenable number.

90750513781 is a deficient number, since it is larger than the sum of its proper divisors (2231211).

90750513781 is a wasteful number, since it uses less digits than its factorization.

90750513781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231210.

The product of its (nonzero) digits is 264600, while the sum is 46.

The spelling of 90750513781 in words is "ninety billion, seven hundred fifty million, five hundred thirteen thousand, seven hundred eighty-one".