155661101 has 2 divisors, whose sum is σ = 155661102. Its totient is φ = 155661100.

The previous prime is 155661097. The next prime is 155661127. The reversal of 155661101 is 101166551.

155661101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (155661127) can be obtained adding 155661101 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 23755876 = 11485^2 + 4874^2 .

It is a cyclic number.

It is not a de Polignac number, because 155661101 - 2² = 155661097 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155661151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77830550 + 77830551.

It is an arithmetic number, because the mean of its divisors is an integer number (77830551).

Almost surely, 2^155661101 is an apocalyptic number.

It is an amenable number.

155661101 is a deficient number, since it is larger than the sum of its proper divisors (1).

155661101 is an equidigital number, since it uses as much as digits as its factorization.

155661101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 155661101 is about 12476.4218027446. The cubic root of 155661101 is about 537.9311569204.

The spelling of 155661101 in words is "one hundred fifty-five million, six hundred sixty-one thousand, one hundred one".