155193421 has 8 divisors (see below), whose sum is σ = 157068288. Its totient is φ = 153330000.

The previous prime is 155193403. The next prime is 155193427. The reversal of 155193421 is 124391551.

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

It is a cyclic number.

It is not a de Polignac number, because 155193421 - 2⁹ = 155192909 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 (155193427) 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, 26151 + ... + 31531.

It is an arithmetic number, because the mean of its divisors is an integer number (19633536).

Almost surely, 2^155193421 is an apocalyptic number.

It is an amenable number.

155193421 is a deficient number, since it is larger than the sum of its proper divisors (1874867).

155193421 is a wasteful number, since it uses less digits than its factorization.

155193421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5723.

The product of its digits is 5400, while the sum is 31.

The square root of 155193421 is about 12457.6651504204. The cubic root of 155193421 is about 537.3918827788.

The spelling of 155193421 in words is "one hundred fifty-five million, one hundred ninety-three thousand, four hundred twenty-one".