69031782121 has 3 divisors (see below), whose sum is σ = 69032044861. Its totient is φ = 69031519382.

The previous prime is 69031782101. The next prime is 69031782143. The reversal of 69031782121 is 12128713096.

The square root of 69031782121 is 262739.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 69031782121 - 2¹⁷ = 69031651049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69031782101) 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 2 ways as a sum of consecutive naturals, for example, 131370 + ... + 394108.

Almost surely, 2^69031782121 is an apocalyptic number.

69031782121 is the 262739-th square number.

69031782121 is the 131370-th centered octagonal number.

It is an amenable number.

69031782121 is a deficient number, since it is larger than the sum of its proper divisors (262740).

69031782121 is an frugal number, since it uses more digits than its factorization.

69031782121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525478 (or 262739 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 69031782121 in words is "sixty-nine billion, thirty-one million, seven hundred eighty-two thousand, one hundred twenty-one".