215423080981 has 4 divisors (see below), whose sum is σ = 218018539872. Its totient is φ = 212827622092.

The previous prime is 215423080909. The next prime is 215423081017. The reversal of 215423080981 is 189080324512.

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 not a de Polignac number, because 215423080981 - 2¹³ = 215423072789 is a prime.

It is a super-2 number, since 2×215423080981² (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 (215423080781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1297729321 + ... + 1297729486.

It is an arithmetic number, because the mean of its divisors is an integer number (54504634968).

Almost surely, 2^215423080981 is an apocalyptic number.

It is an amenable number.

215423080981 is a deficient number, since it is larger than the sum of its proper divisors (2595458891).

215423080981 is an equidigital number, since it uses as much as digits as its factorization.

215423080981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595458890.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 215423080981 in words is "two hundred fifteen billion, four hundred twenty-three million, eighty thousand, nine hundred eighty-one".