144721761 has 4 divisors (see below), whose sum is σ = 192962352. Its totient is φ = 96481172.

The previous prime is 144721757. The next prime is 144721771. The reversal of 144721761 is 167127441.

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 144721761 - 2² = 144721757 is a prime.

It is a super-2 number, since 2×144721761² = 41888776213882242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (144721711) 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, 24120291 + ... + 24120296.

It is an arithmetic number, because the mean of its divisors is an integer number (48240588).

Almost surely, 2^144721761 is an apocalyptic number.

It is an amenable number.

144721761 is a deficient number, since it is larger than the sum of its proper divisors (48240591).

144721761 is an equidigital number, since it uses as much as digits as its factorization.

144721761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48240590.

The product of its digits is 9408, while the sum is 33.

The square root of 144721761 is about 12030.0357854829. The cubic root of 144721761 is about 525.0225369010.

The spelling of 144721761 in words is "one hundred forty-four million, seven hundred twenty-one thousand, seven hundred sixty-one".