97905981 has 8 divisors (see below), whose sum is σ = 130745664. Its totient is φ = 65168480.

The previous prime is 97905979. The next prime is 97906013. The reversal of 97905981 is 18950979.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97905981 - 2¹ = 97905979 is a prime.

It is a super-2 number, since 2×97905981² = 19171162231144722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97905981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97905911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23280 + ... + 27161.

It is an arithmetic number, because the mean of its divisors is an integer number (16343208).

Almost surely, 2^97905981 is an apocalyptic number.

It is an amenable number.

97905981 is a deficient number, since it is larger than the sum of its proper divisors (32839683).

97905981 is a wasteful number, since it uses less digits than its factorization.

97905981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51091.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 97905981 is about 9894.7451205173. The cubic root of 97905981 is about 460.8961437284.

The spelling of 97905981 in words is "ninety-seven million, nine hundred five thousand, nine hundred eighty-one".