153661001 has 8 divisors (see below), whose sum is σ = 169002624. Its totient is φ = 138822480.

The previous prime is 153660979. The next prime is 153661019. The reversal of 153661001 is 100166351.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-153661001 is a prime.

It is a super-2 number, since 2×153661001² = 47223406456644002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153661021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125135 + ... + 126356.

It is an arithmetic number, because the mean of its divisors is an integer number (21125328).

Almost surely, 2^153661001 is an apocalyptic number.

It is an amenable number.

153661001 is a deficient number, since it is larger than the sum of its proper divisors (15341623).

153661001 is a wasteful number, since it uses less digits than its factorization.

153661001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251551.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 153661001 is about 12396.0074620823. The cubic root of 153661001 is about 535.6172466537.

The spelling of 153661001 in words is "one hundred fifty-three million, six hundred sixty-one thousand, one".