69147981 has 24 divisors (see below), whose sum is σ = 114892544. Its totient is φ = 39255840.

The previous prime is 69147979. The next prime is 69147997. The reversal of 69147981 is 18974196.

It is a happy number.

It is not a de Polignac number, because 69147981 - 2¹ = 69147979 is a prime.

It is a super-2 number, since 2×69147981² = 9562886552752722, 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 (69147181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6396 + ... + 13386.

Almost surely, 2^69147981 is an apocalyptic number.

It is an amenable number.

69147981 is a deficient number, since it is larger than the sum of its proper divisors (45744563).

69147981 is a wasteful number, since it uses less digits than its factorization.

69147981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161 (or 7158 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 69147981 is about 8315.5265016714. The cubic root of 69147981 is about 410.4495980149.

The spelling of 69147981 in words is "sixty-nine million, one hundred forty-seven thousand, nine hundred eighty-one".