69139621 has 2 divisors, whose sum is σ = 69139622. Its totient is φ = 69139620.

The previous prime is 69139607. The next prime is 69139661. The reversal of 69139621 is 12693196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69056100 + 83521 = 8310^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 69139621 - 2¹⁹ = 68615333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69139661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34569810 + 34569811.

It is an arithmetic number, because the mean of its divisors is an integer number (34569811).

Almost surely, 2^69139621 is an apocalyptic number.

It is an amenable number.

69139621 is a deficient number, since it is larger than the sum of its proper divisors (1).

69139621 is an equidigital number, since it uses as much as digits as its factorization.

69139621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 69139621 is about 8315.0238123532. The cubic root of 69139621 is about 410.4330562115.

The spelling of 69139621 in words is "sixty-nine million, one hundred thirty-nine thousand, six hundred twenty-one".