93649981 has 2 divisors, whose sum is σ = 93649982. Its totient is φ = 93649980.

The previous prime is 93649973. The next prime is 93650009. The reversal of 93649981 is 18994639.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69305625 + 24344356 = 8325^2 + 4934^2 .

It is a cyclic number.

It is not a de Polignac number, because 93649981 - 2³ = 93649973 is a prime.

It is a super-2 number, since 2×93649981² = 17540637882600722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (93649901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46824990 + 46824991.

It is an arithmetic number, because the mean of its divisors is an integer number (46824991).

Almost surely, 2^93649981 is an apocalyptic number.

It is an amenable number.

93649981 is a deficient number, since it is larger than the sum of its proper divisors (1).

93649981 is an equidigital number, since it uses as much as digits as its factorization.

93649981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 49.

The square root of 93649981 is about 9677.2920282484. The cubic root of 93649981 is about 454.1185382025.

The spelling of 93649981 in words is "ninety-three million, six hundred forty-nine thousand, nine hundred eighty-one".