69139481 has 2 divisors, whose sum is σ = 69139482. Its totient is φ = 69139480.

The previous prime is 69139409. The next prime is 69139519. The reversal of 69139481 is 18493196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69139225 + 256 = 8315^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 69139481 - 2²⁶ = 2030617 is a prime.

It is a super-3 number, since 3×69139481³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (69136481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34569740 + 34569741.

It is an arithmetic number, because the mean of its divisors is an integer number (34569741).

Almost surely, 2^69139481 is an apocalyptic number.

It is an amenable number.

69139481 is a deficient number, since it is larger than the sum of its proper divisors (1).

69139481 is an equidigital number, since it uses as much as digits as its factorization.

69139481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 69139481 is about 8315.0153938523. The cubic root of 69139481 is about 410.4327791843.

The spelling of 69139481 in words is "sixty-nine million, one hundred thirty-nine thousand, four hundred eighty-one".