363964981 has 4 divisors (see below), whose sum is σ = 365279212. Its totient is φ = 362650752.

The previous prime is 363964973. The next prime is 363965003. The reversal of 363964981 is 189469363.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189469363 = 8443 ⋅22441.

It can be written as a sum of positive squares in 2 ways, for example, as 159617956 + 204347025 = 12634^2 + 14295^2 .

It is a cyclic number.

It is not a de Polignac number, because 363964981 - 2³ = 363964973 is a prime.

It is a super-2 number, since 2×363964981² = 264941014788660722, 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 (363964481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656700 + ... + 657253.

It is an arithmetic number, because the mean of its divisors is an integer number (91319803).

Almost surely, 2^363964981 is an apocalyptic number.

It is an amenable number.

363964981 is a deficient number, since it is larger than the sum of its proper divisors (1314231).

363964981 is a wasteful number, since it uses less digits than its factorization.

363964981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314230.

The product of its digits is 839808, while the sum is 49.

The square root of 363964981 is about 19077.8662590972. The cubic root of 363964981 is about 713.9808003008.

The spelling of 363964981 in words is "three hundred sixty-three million, nine hundred sixty-four thousand, nine hundred eighty-one".