3633399981 has 24 divisors (see below), whose sum is σ = 5430647040. Its totient is φ = 2338459200.

The previous prime is 3633399971. The next prime is 3633399989. The reversal of 3633399981 is 1899933363.

3633399981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3633399981 - 2¹⁰ = 3633398957 is a prime.

It is a super-2 number, since 2×3633399981² = 26403190843861600722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3633399989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101361 + ... + 132441.

It is an arithmetic number, because the mean of its divisors is an integer number (226276960).

Almost surely, 2^3633399981 is an apocalyptic number.

3633399981 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3633399981 is a deficient number, since it is larger than the sum of its proper divisors (1797247059).

3633399981 is a wasteful number, since it uses less digits than its factorization.

3633399981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31537 (or 31534 counting only the distinct ones).

The product of its digits is 2834352, while the sum is 54.

The square root of 3633399981 is about 60277.6905745401. The cubic root of 3633399981 is about 1537.3440447802.

The spelling of 3633399981 in words is "three billion, six hundred thirty-three million, three hundred ninety-nine thousand, nine hundred eighty-one".