155441551 has 4 divisors (see below), whose sum is σ = 159642712. Its totient is φ = 151240392.

The previous prime is 155441543. The next prime is 155441563. The reversal of 155441551 is 155144551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155144551 = 9433 ⋅16447.

It is a cyclic number.

It is not a de Polignac number, because 155441551 - 2³ = 155441543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155441501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100525 + ... + 2100598.

It is an arithmetic number, because the mean of its divisors is an integer number (39910678).

Almost surely, 2^155441551 is an apocalyptic number.

155441551 is a deficient number, since it is larger than the sum of its proper divisors (4201161).

155441551 is an equidigital number, since it uses as much as digits as its factorization.

155441551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201160.

The product of its digits is 10000, while the sum is 31.

The square root of 155441551 is about 12467.6201016874. The cubic root of 155441551 is about 537.6781321254.

The spelling of 155441551 in words is "one hundred fifty-five million, four hundred forty-one thousand, five hundred fifty-one".