69847981 has 6 divisors (see below), whose sum is σ = 81251790. Its totient is φ = 59869656.

The previous prime is 69847961. The next prime is 69848003. The reversal of 69847981 is 18974896.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66275881 + 3572100 = 8141^2 + 1890^2 .

It is not a de Polignac number, because 69847981 - 2⁷ = 69847853 is a prime.

It is a super-2 number, since 2×69847981² = 9757480899552722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69847931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 712686 + ... + 712783.

It is an arithmetic number, because the mean of its divisors is an integer number (13541965).

Almost surely, 2^69847981 is an apocalyptic number.

It is an amenable number.

69847981 is a deficient number, since it is larger than the sum of its proper divisors (11403809).

69847981 is a wasteful number, since it uses less digits than its factorization.

69847981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425483 (or 1425476 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 69847981 is about 8357.5104546749. The cubic root of 69847981 is about 411.8299739088.

The spelling of 69847981 in words is "sixty-nine million, eight hundred forty-seven thousand, nine hundred eighty-one".