155378551 has 2 divisors, whose sum is σ = 155378552. Its totient is φ = 155378550.

The previous prime is 155378539. The next prime is 155378567. The reversal of 155378551 is 155873551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155378551 - 2¹¹ = 155376503 is a prime.

It is a super-2 number, since 2×155378551² = 48284988221719202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155378581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77689275 + 77689276.

It is an arithmetic number, because the mean of its divisors is an integer number (77689276).

Almost surely, 2^155378551 is an apocalyptic number.

155378551 is a deficient number, since it is larger than the sum of its proper divisors (1).

155378551 is an equidigital number, since it uses as much as digits as its factorization.

155378551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105000, while the sum is 40.

The square root of 155378551 is about 12465.0933008943. The cubic root of 155378551 is about 537.6054825250.

The spelling of 155378551 in words is "one hundred fifty-five million, three hundred seventy-eight thousand, five hundred fifty-one".