69999981 has 8 divisors (see below), whose sum is σ = 94046304. Its totient is φ = 46310160.

The previous prime is 69999973. The next prime is 69999989. The reversal of 69999981 is 18999996.

It is an interprime number because it is at equal distance from previous prime (69999973) and next prime (69999989).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 69999981 - 2³ = 69999973 is a prime.

It is a super-2 number, since 2×69999981² = 9799994680000722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88666 + ... + 89451.

It is an arithmetic number, because the mean of its divisors is an integer number (11755788).

Almost surely, 2^69999981 is an apocalyptic number.

It is an amenable number.

69999981 is a deficient number, since it is larger than the sum of its proper divisors (24046323).

69999981 is a wasteful number, since it uses less digits than its factorization.

69999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178251.

The product of its digits is 2834352, while the sum is 60.

The square root of 69999981 is about 8366.5991298735. The cubic root of 69999981 is about 412.1284926930.

The spelling of 69999981 in words is "sixty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".