69138887 has 2 divisors, whose sum is σ = 69138888. Its totient is φ = 69138886.

The previous prime is 69138869. The next prime is 69138899. The reversal of 69138887 is 78883196.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 69138887 - 2¹⁰ = 69137863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69134887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34569443 + 34569444.

It is an arithmetic number, because the mean of its divisors is an integer number (34569444).

Almost surely, 2^69138887 is an apocalyptic number.

69138887 is a deficient number, since it is larger than the sum of its proper divisors (1).

69138887 is an equidigital number, since it uses as much as digits as its factorization.

69138887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The square root of 69138887 is about 8314.9796752608. The cubic root of 69138887 is about 410.4316037933.

The spelling of 69138887 in words is "sixty-nine million, one hundred thirty-eight thousand, eight hundred eighty-seven".