69629981 has 2 divisors, whose sum is σ = 69629982. Its totient is φ = 69629980.

The previous prime is 69629941. The next prime is 69630007. The reversal of 69629981 is 18992696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69388900 + 241081 = 8330^2 + 491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69629981 is a prime.

It is a super-2 number, since 2×69629981² = 9696668508120722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69629921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34814990 + 34814991.

It is an arithmetic number, because the mean of its divisors is an integer number (34814991).

Almost surely, 2^69629981 is an apocalyptic number.

It is an amenable number.

69629981 is a deficient number, since it is larger than the sum of its proper divisors (1).

69629981 is an equidigital number, since it uses as much as digits as its factorization.

69629981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 50.

The square root of 69629981 is about 8344.4581010393. The cubic root of 69629981 is about 411.4010781973.

The spelling of 69629981 in words is "sixty-nine million, six hundred twenty-nine thousand, nine hundred eighty-one".