155311551 has 24 divisors (see below), whose sum is σ = 230967360. Its totient is φ = 100526400.

The previous prime is 155311549. The next prime is 155311553. The reversal of 155311551 is 155113551.

It is an interprime number because it is at equal distance from previous prime (155311549) and next prime (155311553).

It is not a de Polignac number, because 155311551 - 2¹ = 155311549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155311553) 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 23 ways as a sum of consecutive naturals, for example, 41581 + ... + 45161.

It is an arithmetic number, because the mean of its divisors is an integer number (9623640).

Almost surely, 2^155311551 is an apocalyptic number.

155311551 is a deficient number, since it is larger than the sum of its proper divisors (75655809).

155311551 is a wasteful number, since it uses less digits than its factorization.

155311551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727 (or 3724 counting only the distinct ones).

The product of its digits is 1875, while the sum is 27.

The square root of 155311551 is about 12462.4055061613. The cubic root of 155311551 is about 537.5281987009.

The spelling of 155311551 in words is "one hundred fifty-five million, three hundred eleven thousand, five hundred fifty-one".