155801101 has 2 divisors, whose sum is σ = 155801102. Its totient is φ = 155801100.

The previous prime is 155801089. The next prime is 155801119. The reversal of 155801101 is 101108551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145082025 + 10719076 = 12045^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 155801101 - 2¹⁷ = 155670029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155801131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77900550 + 77900551.

It is an arithmetic number, because the mean of its divisors is an integer number (77900551).

Almost surely, 2^155801101 is an apocalyptic number.

It is an amenable number.

155801101 is a deficient number, since it is larger than the sum of its proper divisors (1).

155801101 is an equidigital number, since it uses as much as digits as its factorization.

155801101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 22.

The square root of 155801101 is about 12482.0311247809. The cubic root of 155801101 is about 538.0923785207.

Adding to 155801101 its reverse (101108551), we get a palindrome (256909652).

The spelling of 155801101 in words is "one hundred fifty-five million, eight hundred one thousand, one hundred one".