69661139 has 2 divisors, whose sum is σ = 69661140. Its totient is φ = 69661138.

The previous prime is 69661127. The next prime is 69661157. The reversal of 69661139 is 93116696.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69661139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 69661096 and 69661105.

It is not a weakly prime, because it can be changed into another prime (69661159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34830569 + 34830570.

It is an arithmetic number, because the mean of its divisors is an integer number (34830570).

Almost surely, 2^69661139 is an apocalyptic number.

69661139 is a deficient number, since it is larger than the sum of its proper divisors (1).

69661139 is an equidigital number, since it uses as much as digits as its factorization.

69661139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 69661139 is about 8346.3248798498. The cubic root of 69661139 is about 411.4624335842.

The spelling of 69661139 in words is "sixty-nine million, six hundred sixty-one thousand, one hundred thirty-nine".