97127781 has 16 divisors (see below), whose sum is σ = 135567744. Its totient is φ = 61737984.

The previous prime is 97127773. The next prime is 97127801. The reversal of 97127781 is 18772179.

It is not a de Polignac number, because 97127781 - 2³ = 97127773 is a prime.

It is a super-2 number, since 2×97127781² = 18867611683967922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97127711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21165 + ... + 25341.

It is an arithmetic number, because the mean of its divisors is an integer number (8472984).

Almost surely, 2^97127781 is an apocalyptic number.

It is an amenable number.

97127781 is a deficient number, since it is larger than the sum of its proper divisors (38439963).

97127781 is a wasteful number, since it uses less digits than its factorization.

97127781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540.

The product of its digits is 49392, while the sum is 42.

The square root of 97127781 is about 9855.3427642066. The cubic root of 97127781 is about 459.6717585867.

The spelling of 97127781 in words is "ninety-seven million, one hundred twenty-seven thousand, seven hundred eighty-one".