155327621 has 4 divisors (see below), whose sum is σ = 158632512. Its totient is φ = 152022732.

The previous prime is 155327609. The next prime is 155327651. The reversal of 155327621 is 126723551.

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, and also an emirpimes, since its reverse is a distinct semiprime: 126723551 = 6029 ⋅21019.

It is a cyclic number.

It is not a de Polignac number, because 155327621 - 2¹⁰ = 155326597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155327651) 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, 1652375 + ... + 1652468.

It is an arithmetic number, because the mean of its divisors is an integer number (39658128).

Almost surely, 2^155327621 is an apocalyptic number.

It is an amenable number.

155327621 is a deficient number, since it is larger than the sum of its proper divisors (3304891).

155327621 is an equidigital number, since it uses as much as digits as its factorization.

155327621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304890.

The product of its digits is 12600, while the sum is 32.

The square root of 155327621 is about 12463.0502285757. The cubic root of 155327621 is about 537.5467373096.

The spelling of 155327621 in words is "one hundred fifty-five million, three hundred twenty-seven thousand, six hundred twenty-one".