143253661 has 4 divisors (see below), whose sum is σ = 143508672. Its totient is φ = 142998652.

The previous prime is 143253619. The next prime is 143253701. The reversal of 143253661 is 166352341.

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 143253661 - 2²⁷ = 9035933 is a prime.

It is a super-2 number, since 2×143253661² = 41043222779805842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143253961) 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, 126661 + ... + 127786.

It is an arithmetic number, because the mean of its divisors is an integer number (35877168).

Almost surely, 2^143253661 is an apocalyptic number.

It is an amenable number.

143253661 is a deficient number, since it is larger than the sum of its proper divisors (255011).

143253661 is an equidigital number, since it uses as much as digits as its factorization.

143253661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255010.

The product of its digits is 12960, while the sum is 31.

The square root of 143253661 is about 11968.8621430778. The cubic root of 143253661 is about 523.2411721446.

The spelling of 143253661 in words is "one hundred forty-three million, two hundred fifty-three thousand, six hundred sixty-one".