111970813 has 2 divisors, whose sum is σ = 111970814. Its totient is φ = 111970812.

The previous prime is 111970759. The next prime is 111970841. The reversal of 111970813 is 318079111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111894084 + 76729 = 10578^2 + 277^2 .

It is a cyclic number.

It is not a de Polignac number, because 111970813 - 2¹³ = 111962621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111970013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55985406 + 55985407.

It is an arithmetic number, because the mean of its divisors is an integer number (55985407).

Almost surely, 2^111970813 is an apocalyptic number.

It is an amenable number.

111970813 is a deficient number, since it is larger than the sum of its proper divisors (1).

111970813 is an equidigital number, since it uses as much as digits as its factorization.

111970813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 31.

The square root of 111970813 is about 10581.6261982741. The cubic root of 111970813 is about 481.9865772793.

The spelling of 111970813 in words is "one hundred eleven million, nine hundred seventy thousand, eight hundred thirteen".