93161421781 has 4 divisors (see below), whose sum is σ = 93163584832. Its totient is φ = 93159258732.

The previous prime is 93161421757. The next prime is 93161421797. The reversal of 93161421781 is 18712416139.

It is a happy number.

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 93161421781 - 2²³ = 93153033173 is a prime.

It is a super-2 number, since 2×93161421781² (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 (93161421701) 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, 1015581 + ... + 1103506.

It is an arithmetic number, because the mean of its divisors is an integer number (23290896208).

Almost surely, 2^93161421781 is an apocalyptic number.

It is an amenable number.

93161421781 is a deficient number, since it is larger than the sum of its proper divisors (2163051).

93161421781 is a wasteful number, since it uses less digits than its factorization.

93161421781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163050.

The product of its digits is 72576, while the sum is 43.

The spelling of 93161421781 in words is "ninety-three billion, one hundred sixty-one million, four hundred twenty-one thousand, seven hundred eighty-one".