69139789 has 2 divisors, whose sum is σ = 69139790. Its totient is φ = 69139788.

The previous prime is 69139751. The next prime is 69139793. The reversal of 69139789 is 98793196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55875625 + 13264164 = 7475^2 + 3642^2 .

It is a cyclic number.

It is not a de Polignac number, because 69139789 - 2⁷ = 69139661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69139709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34569894 + 34569895.

It is an arithmetic number, because the mean of its divisors is an integer number (34569895).

Almost surely, 2^69139789 is an apocalyptic number.

It is an amenable number.

69139789 is a deficient number, since it is larger than the sum of its proper divisors (1).

69139789 is an equidigital number, since it uses as much as digits as its factorization.

69139789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 69139789 is about 8315.0339145430. The cubic root of 69139789 is about 410.4333886436.

The spelling of 69139789 in words is "sixty-nine million, one hundred thirty-nine thousand, seven hundred eighty-nine".