153997505 has 4 divisors (see below), whose sum is σ = 184797012. Its totient is φ = 123198000.

The previous prime is 153997483. The next prime is 153997523. The reversal of 153997505 is 505799351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505799351 = 17 ⋅29752903.

It can be written as a sum of positive squares in 2 ways, for example, as 121176064 + 32821441 = 11008^2 + 5729^2 .

It is a de Polignac number, because none of the positive numbers 2^k-153997505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15399746 + ... + 15399755.

It is an arithmetic number, because the mean of its divisors is an integer number (46199253).

Almost surely, 2^153997505 is an apocalyptic number.

It is an amenable number.

153997505 is a deficient number, since it is larger than the sum of its proper divisors (30799507).

153997505 is an equidigital number, since it uses as much as digits as its factorization.

153997505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30799506.

The product of its (nonzero) digits is 212625, while the sum is 44.

The square root of 153997505 is about 12409.5731191689. The cubic root of 153997505 is about 536.0079463903.

The spelling of 153997505 in words is "one hundred fifty-three million, nine hundred ninety-seven thousand, five hundred five".