111629897 has 2 divisors, whose sum is σ = 111629898. Its totient is φ = 111629896.

The previous prime is 111629891. The next prime is 111629899. The reversal of 111629897 is 798926111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106894921 + 4734976 = 10339^2 + 2176^2 .

It is a cyclic number.

It is not a de Polignac number, because 111629897 - 2⁸ = 111629641 is a prime.

It is a super-2 number, since 2×111629897² = 24922467808461218, which contains 22 as substring.

Together with 111629899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111629891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55814948 + 55814949.

It is an arithmetic number, because the mean of its divisors is an integer number (55814949).

Almost surely, 2^111629897 is an apocalyptic number.

111629897 is the 5648-th centered heptagonal number.

It is an amenable number.

111629897 is a deficient number, since it is larger than the sum of its proper divisors (1).

111629897 is an equidigital number, since it uses as much as digits as its factorization.

111629897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 44.

The square root of 111629897 is about 10565.5050518184. The cubic root of 111629897 is about 481.4969140098.

It can be divided in two parts, 1116 and 29897, that added together give a palindrome (31013).

The spelling of 111629897 in words is "one hundred eleven million, six hundred twenty-nine thousand, eight hundred ninety-seven".