111020639 has 2 divisors, whose sum is σ = 111020640. Its totient is φ = 111020638.

The previous prime is 111020621. The next prime is 111020687. The reversal of 111020639 is 936020111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111020639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111020699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510319 + 55510320.

It is an arithmetic number, because the mean of its divisors is an integer number (55510320).

Almost surely, 2^111020639 is an apocalyptic number.

111020639 is a deficient number, since it is larger than the sum of its proper divisors (1).

111020639 is an equidigital number, since it uses as much as digits as its factorization.

111020639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 111020639 is about 10536.6331909201. The cubic root of 111020639 is about 480.6193379744.

The spelling of 111020639 in words is "one hundred eleven million, twenty thousand, six hundred thirty-nine".