155278471 has 2 divisors, whose sum is σ = 155278472. Its totient is φ = 155278470.

The previous prime is 155278397. The next prime is 155278477. The reversal of 155278471 is 174872551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155278471 - 2¹⁵ = 155245703 is a prime.

It is a super-3 number, since 3×155278471³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155278477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77639235 + 77639236.

It is an arithmetic number, because the mean of its divisors is an integer number (77639236).

Almost surely, 2^155278471 is an apocalyptic number.

155278471 is a deficient number, since it is larger than the sum of its proper divisors (1).

155278471 is an equidigital number, since it uses as much as digits as its factorization.

155278471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78400, while the sum is 40.

The square root of 155278471 is about 12461.0782438760. The cubic root of 155278471 is about 537.4900330584.

The spelling of 155278471 in words is "one hundred fifty-five million, two hundred seventy-eight thousand, four hundred seventy-one".