155020101 has 4 divisors (see below), whose sum is σ = 206693472. Its totient is φ = 103346732.

The previous prime is 155020097. The next prime is 155020141. The reversal of 155020101 is 101020551.

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.

It is a cyclic number.

It is not a de Polignac number, because 155020101 - 2² = 155020097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155020141) 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, 25836681 + ... + 25836686.

It is an arithmetic number, because the mean of its divisors is an integer number (51673368).

Almost surely, 2^155020101 is an apocalyptic number.

It is an amenable number.

155020101 is a deficient number, since it is larger than the sum of its proper divisors (51673371).

155020101 is an equidigital number, since it uses as much as digits as its factorization.

155020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51673370.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 155020101 is about 12450.7068474043. The cubic root of 155020101 is about 537.1917551891.

Adding to 155020101 its reverse (101020551), we get a palindrome (256040652).

The spelling of 155020101 in words is "one hundred fifty-five million, twenty thousand, one hundred one".