413721981 has 6 divisors (see below), whose sum is σ = 597598430. Its totient is φ = 275814648.

The previous prime is 413721977. The next prime is 413721989. The reversal of 413721981 is 189127314.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 220789881 + 192932100 = 14859^2 + 13890^2 .

It is not a de Polignac number, because 413721981 - 2² = 413721977 is a prime.

It is a super-2 number, since 2×413721981² = 342331755125128722, 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 (413721989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22984546 + ... + 22984563.

Almost surely, 2^413721981 is an apocalyptic number.

It is an amenable number.

413721981 is a deficient number, since it is larger than the sum of its proper divisors (183876449).

413721981 is a wasteful number, since it uses less digits than its factorization.

413721981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45969115 (or 45969112 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 413721981 is about 20340.1568578023. The cubic root of 413721981 is about 745.1371193343.

The spelling of 413721981 in words is "four hundred thirteen million, seven hundred twenty-one thousand, nine hundred eighty-one".