155032251 has 8 divisors (see below), whose sum is σ = 225501504. Its totient is φ = 93958920.

The previous prime is 155032249. The next prime is 155032291. The reversal of 155032251 is 152230551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155032251 - 2¹ = 155032249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155032291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2348941 + ... + 2349006.

It is an arithmetic number, because the mean of its divisors is an integer number (28187688).

Almost surely, 2^155032251 is an apocalyptic number.

155032251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155032251 is a deficient number, since it is larger than the sum of its proper divisors (70469253).

155032251 is a wasteful number, since it uses less digits than its factorization.

155032251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697961.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 155032251 is about 12451.1947619496. The cubic root of 155032251 is about 537.2057893031.

The spelling of 155032251 in words is "one hundred fifty-five million, thirty-two thousand, two hundred fifty-one".