97781189 has 12 divisors (see below), whose sum is σ = 107825760. Its totient is φ = 88605000.

The previous prime is 97781153. The next prime is 97781209. The reversal of 97781189 is 98118779.

It is not a de Polignac number, because 97781189 - 2¹² = 97777093 is a prime.

It is a super-2 number, since 2×97781189² = 19122321844507442, which 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 (97781149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42314 + ... + 44564.

It is an arithmetic number, because the mean of its divisors is an integer number (8985480).

Almost surely, 2^97781189 is an apocalyptic number.

It is an amenable number.

97781189 is a deficient number, since it is larger than the sum of its proper divisors (10044571).

97781189 is a wasteful number, since it uses less digits than its factorization.

97781189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632 (or 2621 counting only the distinct ones).

The product of its digits is 254016, while the sum is 50.

The square root of 97781189 is about 9888.4371363730. The cubic root of 97781189 is about 460.7002394360.

The spelling of 97781189 in words is "ninety-seven million, seven hundred eighty-one thousand, one hundred eighty-nine".