69138947 has 2 divisors, whose sum is σ = 69138948. Its totient is φ = 69138946.

The previous prime is 69138919. The next prime is 69138991. The reversal of 69138947 is 74983196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 69138947 - 2⁸ = 69138691 is a prime.

It is not a weakly prime, because it can be changed into another prime (69138347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34569473 + 34569474.

It is an arithmetic number, because the mean of its divisors is an integer number (34569474).

Almost surely, 2^69138947 is an apocalyptic number.

69138947 is a deficient number, since it is larger than the sum of its proper divisors (1).

69138947 is an equidigital number, since it uses as much as digits as its factorization.

69138947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 69138947 is about 8314.9832832063. The cubic root of 69138947 is about 410.4317225199.

The spelling of 69138947 in words is "sixty-nine million, one hundred thirty-eight thousand, nine hundred forty-seven".