97228386781 has 4 divisors (see below), whose sum is σ = 98876325600. Its totient is φ = 95580447964.

The previous prime is 97228386743. The next prime is 97228386809. The reversal of 97228386781 is 18768382279.

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 97228386781 - 2²³ = 97219998173 is a prime.

It is a super-2 number, since 2×97228386781² (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 (97228306781) 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, 823969321 + ... + 823969438.

It is an arithmetic number, because the mean of its divisors is an integer number (24719081400).

Almost surely, 2^97228386781 is an apocalyptic number.

It is an amenable number.

97228386781 is a deficient number, since it is larger than the sum of its proper divisors (1647938819).

97228386781 is a wasteful number, since it uses less digits than its factorization.

97228386781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647938818.

The product of its digits is 16257024, while the sum is 61.

The spelling of 97228386781 in words is "ninety-seven billion, two hundred twenty-eight million, three hundred eighty-six thousand, seven hundred eighty-one".