97781111 has 2 divisors, whose sum is σ = 97781112. Its totient is φ = 97781110.

The previous prime is 97781083. The next prime is 97781137. The reversal of 97781111 is 11118779.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97781111 - 2¹⁰ = 97780087 is a prime.

It is a super-2 number, since 2×97781111² = 19122291336788642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97781911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48890555 + 48890556.

It is an arithmetic number, because the mean of its divisors is an integer number (48890556).

Almost surely, 2^97781111 is an apocalyptic number.

97781111 is a deficient number, since it is larger than the sum of its proper divisors (1).

97781111 is an equidigital number, since it uses as much as digits as its factorization.

97781111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 35.

The square root of 97781111 is about 9888.4331923718. The cubic root of 97781111 is about 460.7001169359.

The spelling of 97781111 in words is "ninety-seven million, seven hundred eighty-one thousand, one hundred eleven".