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153681 = 3114657

153681 has 8 divisors (see below), whose sum is σ = 223584. Its totient is φ = 93120.

The previous prime is 153649. The next prime is 153689. The reversal of 153681 is 186351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 153681 - 25 = 153649 is a prime.

It is a super-2 number, since 2×1536812 = 47235699522, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 153681.

It is not an unprimeable number, because it can be changed into a prime (153689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2296 + ... + 2361.

It is an arithmetic number, because the mean of its divisors is an integer number (27948).

2153681 is an apocalyptic number.

153681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

153681 is a deficient number, since it is larger than the sum of its proper divisors (69903).

153681 is a wasteful number, since it uses less digits than its factorization.

153681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671.

The product of its digits is 720, while the sum is 24.

The square root of 153681 is about 392.0216830738. The cubic root of 153681 is about 53.5640482531.

The spelling of 153681 in words is "one hundred fifty-three thousand, six hundred eighty-one".

Divisors: 1 3 11 33 4657 13971 51227 153681