155404551 has 16 divisors (see below), whose sum is σ = 213172704. Its totient is φ = 100629504.

The previous prime is 155404549. The next prime is 155404577.

155404551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 155404551 - 2¹ = 155404549 is a prime.

155404551 is a modest number, since divided by 4551 gives 1554 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155404511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107731 + ... + 109163.

It is an arithmetic number, because the mean of its divisors is an integer number (13323294).

Almost surely, 2^155404551 is an apocalyptic number.

155404551 is a deficient number, since it is larger than the sum of its proper divisors (57768153).

155404551 is a wasteful number, since it uses less digits than its factorization.

155404551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450.

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 155404551 is about 12466.1361696397. The cubic root of 155404551 is about 537.6354672792.

Adding to 155404551 its product of nonzero digits (10000), we get a palindrome (155414551).

The spelling of 155404551 in words is "one hundred fifty-five million, four hundred four thousand, five hundred fifty-one".