90921201131 has 2 divisors, whose sum is σ = 90921201132. Its totient is φ = 90921201130.

The previous prime is 90921201071. The next prime is 90921201139. The reversal of 90921201131 is 13110212909.

It is a strong prime.

It is an emirp because it is prime and its reverse (13110212909) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90921201131 is a prime.

It is a super-2 number, since 2×90921201131² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90921201094 and 90921201103.

It is not a weakly prime, because it can be changed into another prime (90921201139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45460600565 + 45460600566.

It is an arithmetic number, because the mean of its divisors is an integer number (45460600566).

Almost surely, 2^90921201131 is an apocalyptic number.

90921201131 is a deficient number, since it is larger than the sum of its proper divisors (1).

90921201131 is an equidigital number, since it uses as much as digits as its factorization.

90921201131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

The spelling of 90921201131 in words is "ninety billion, nine hundred twenty-one million, two hundred one thousand, one hundred thirty-one".