69144979 has 2 divisors, whose sum is σ = 69144980. Its totient is φ = 69144978.

The previous prime is 69144949. The next prime is 69144997. The reversal of 69144979 is 97944196.

Together with next prime (69144997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 69144979 - 2¹³ = 69136787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (69144919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34572489 + 34572490.

It is an arithmetic number, because the mean of its divisors is an integer number (34572490).

Almost surely, 2^69144979 is an apocalyptic number.

69144979 is a deficient number, since it is larger than the sum of its proper divisors (1).

69144979 is an equidigital number, since it uses as much as digits as its factorization.

69144979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 69144979 is about 8315.3459940041. The cubic root of 69144979 is about 410.4436581571.

The spelling of 69144979 in words is "sixty-nine million, one hundred forty-four thousand, nine hundred seventy-nine".