97409781 has 24 divisors (see below), whose sum is σ = 165993984. Its totient is φ = 53866080.

The previous prime is 97409777. The next prime is 97409797. The reversal of 97409781 is 18790479.

It is not a de Polignac number, because 97409781 - 2² = 97409777 is a prime.

It is a super-2 number, since 2×97409781² = 18977330868935922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97409701) 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 23 ways as a sum of consecutive naturals, for example, 22986 + ... + 26891.

It is an arithmetic number, because the mean of its divisors is an integer number (6916416).

Almost surely, 2^97409781 is an apocalyptic number.

It is an amenable number.

97409781 is a deficient number, since it is larger than the sum of its proper divisors (68584203).

97409781 is a wasteful number, since it uses less digits than its factorization.

97409781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49921 (or 49918 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 97409781 is about 9869.6393551132. The cubic root of 97409781 is about 460.1161978037.

The spelling of 97409781 in words is "ninety-seven million, four hundred nine thousand, seven hundred eighty-one".