69138931 has 4 divisors (see below), whose sum is σ = 69538752. Its totient is φ = 68739112.

The previous prime is 69138919. The next prime is 69138947. The reversal of 69138931 is 13983196.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 69138931 - 2⁵ = 69138899 is a prime.

It is a super-2 number, since 2×69138931² = 9560383559645522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69138991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199651 + ... + 199996.

It is an arithmetic number, because the mean of its divisors is an integer number (17384688).

Almost surely, 2^69138931 is an apocalyptic number.

69138931 is a deficient number, since it is larger than the sum of its proper divisors (399821).

69138931 is a wasteful number, since it uses less digits than its factorization.

69138931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399820.

The product of its digits is 34992, while the sum is 40.

The square root of 69138931 is about 8314.9823210876. The cubic root of 69138931 is about 410.4316908595.

The spelling of 69138931 in words is "sixty-nine million, one hundred thirty-eight thousand, nine hundred thirty-one".