4621145981 has 2 divisors, whose sum is σ = 4621145982. Its totient is φ = 4621145980.

The previous prime is 4621145959. The next prime is 4621145983. The reversal of 4621145981 is 1895411264.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3752665081 + 868480900 = 61259^2 + 29470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4621145981 is a prime.

It is a super-3 number, since 3×4621145981³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 4621145983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4621145983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2310572990 + 2310572991.

It is an arithmetic number, because the mean of its divisors is an integer number (2310572991).

Almost surely, 2^4621145981 is an apocalyptic number.

It is an amenable number.

4621145981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4621145981 is an equidigital number, since it uses as much as digits as its factorization.

4621145981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 4621145981 is about 67979.0113270265. The cubic root of 4621145981 is about 1665.6480063567.

The spelling of 4621145981 in words is "four billion, six hundred twenty-one million, one hundred forty-five thousand, nine hundred eighty-one".