654145081 has 4 divisors (see below), whose sum is σ = 663358464. Its totient is φ = 644931700.

The previous prime is 654145073. The next prime is 654145087. The reversal of 654145081 is 180541456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 654145081 - 2³ = 654145073 is a prime.

It is a super-2 number, since 2×654145081² = 855811573992993122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654145087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4606585 + ... + 4606726.

It is an arithmetic number, because the mean of its divisors is an integer number (165839616).

Almost surely, 2^654145081 is an apocalyptic number.

It is an amenable number.

654145081 is a deficient number, since it is larger than the sum of its proper divisors (9213383).

654145081 is an equidigital number, since it uses as much as digits as its factorization.

654145081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9213382.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 654145081 is about 25576.2601058091. The cubic root of 654145081 is about 868.0765543875.

The spelling of 654145081 in words is "six hundred fifty-four million, one hundred forty-five thousand, eighty-one".