633481381 has 4 divisors (see below), whose sum is σ = 682210732. Its totient is φ = 584752032.

The previous prime is 633481367. The next prime is 633481399. The reversal of 633481381 is 183184336.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 262148481 + 371332900 = 16191^2 + 19270^2 .

It is a cyclic number.

It is not a de Polignac number, because 633481381 - 2²⁵ = 599926949 is a prime.

It is a super-2 number, since 2×633481381² = 802597320147334322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 633481381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633481301) 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, 24364656 + ... + 24364681.

It is an arithmetic number, because the mean of its divisors is an integer number (170552683).

Almost surely, 2^633481381 is an apocalyptic number.

It is an amenable number.

633481381 is a deficient number, since it is larger than the sum of its proper divisors (48729351).

633481381 is a wasteful number, since it uses less digits than its factorization.

633481381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48729350.

The product of its digits is 41472, while the sum is 37.

The square root of 633481381 is about 25169.0560212337. The cubic root of 633481381 is about 858.8380653195.

The spelling of 633481381 in words is "six hundred thirty-three million, four hundred eighty-one thousand, three hundred eighty-one".