46521981 has 12 divisors (see below), whose sum is σ = 73307520. Its totient is φ = 28195080.

The previous prime is 46521977. The next prime is 46521983. The reversal of 46521981 is 18912564.

46521981 is a `hidden beast` number, since 46 + 521 + 98 + 1 = 666.

It is not a de Polignac number, because 46521981 - 2² = 46521977 is a prime.

It is a super-2 number, since 2×46521981² = 4328589432328722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (46521983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234861 + ... + 235058.

It is an arithmetic number, because the mean of its divisors is an integer number (6108960).

Almost surely, 2^46521981 is an apocalyptic number.

It is an amenable number.

46521981 is a deficient number, since it is larger than the sum of its proper divisors (26785539).

46521981 is a wasteful number, since it uses less digits than its factorization.

46521981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469936 (or 469933 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 46521981 is about 6820.7023831861. The cubic root of 46521981 is about 359.6549703497.

The spelling of 46521981 in words is "forty-six million, five hundred twenty-one thousand, nine hundred eighty-one".