153993861 has 12 divisors (see below), whose sum is σ = 254212192. Its totient is φ = 87996456.

The previous prime is 153993839. The next prime is 153993881. The reversal of 153993861 is 168399351.

It is not a de Polignac number, because 153993861 - 2⁶ = 153993797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153993811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1222111 + ... + 1222236.

Almost surely, 2^153993861 is an apocalyptic number.

It is an amenable number.

153993861 is a deficient number, since it is larger than the sum of its proper divisors (100218331).

153993861 is a wasteful number, since it uses less digits than its factorization.

153993861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444360 (or 2444357 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 153993861 is about 12409.4262961670. The cubic root of 153993861 is about 536.0037185548.

The spelling of 153993861 in words is "one hundred fifty-three million, nine hundred ninety-three thousand, eight hundred sixty-one".