153449661 has 4 divisors (see below), whose sum is σ = 204599552. Its totient is φ = 102299772.

The previous prime is 153449657. The next prime is 153449669. The reversal of 153449661 is 166944351.

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 not a de Polignac number, because 153449661 - 2² = 153449657 is a prime.

It is a super-2 number, since 2×153449661² = 47093596922029842, 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 (153449669) 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, 25574941 + ... + 25574946.

It is an arithmetic number, because the mean of its divisors is an integer number (51149888).

Almost surely, 2^153449661 is an apocalyptic number.

It is an amenable number.

153449661 is a deficient number, since it is larger than the sum of its proper divisors (51149891).

153449661 is an equidigital number, since it uses as much as digits as its factorization.

153449661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51149890.

The product of its digits is 77760, while the sum is 39.

The square root of 153449661 is about 12387.4800100747. The cubic root of 153449661 is about 535.3715775428.

The spelling of 153449661 in words is "one hundred fifty-three million, four hundred forty-nine thousand, six hundred sixty-one".