155178061 has 2 divisors, whose sum is σ = 155178062. Its totient is φ = 155178060.

The previous prime is 155178017. The next prime is 155178103. The reversal of 155178061 is 160871551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155002500 + 175561 = 12450^2 + 419^2 .

It is an emirp because it is prime and its reverse (160871551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155178061 - 2⁷ = 155177933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155178761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77589030 + 77589031.

It is an arithmetic number, because the mean of its divisors is an integer number (77589031).

Almost surely, 2^155178061 is an apocalyptic number.

It is an amenable number.

155178061 is a deficient number, since it is larger than the sum of its proper divisors (1).

155178061 is an equidigital number, since it uses as much as digits as its factorization.

155178061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 155178061 is about 12457.0486472519. The cubic root of 155178061 is about 537.3741530503.

The spelling of 155178061 in words is "one hundred fifty-five million, one hundred seventy-eight thousand, sixty-one".