55520151 has 4 divisors (see below), whose sum is σ = 74026872. Its totient is φ = 37013432.

The previous prime is 55520149. The next prime is 55520159. The reversal of 55520151 is 15102555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55520151 - 2¹ = 55520149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520159) 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, 9253356 + ... + 9253361.

It is an arithmetic number, because the mean of its divisors is an integer number (18506718).

Almost surely, 2^55520151 is an apocalyptic number.

55520151 is a deficient number, since it is larger than the sum of its proper divisors (18506721).

55520151 is a wasteful number, since it uses less digits than its factorization.

55520151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18506720.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 55520151 is about 7451.1845367029. The cubic root of 55520151 is about 381.4903407618.

It can be divided in two parts, 555 and 20151, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 55520151 in words is "fifty-five million, five hundred twenty thousand, one hundred fifty-one".