1555151 has 4 divisors (see below), whose sum is σ = 1674792. Its totient is φ = 1435512.

The previous prime is 1555133. The next prime is 1555153. The reversal of 1555151 is 1515551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1515551 = 643 ⋅2357.

It is a de Polignac number, because none of the positive numbers 2^k-1555151 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 (1555153) 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, 59801 + ... + 59826.

It is an arithmetic number, because the mean of its divisors is an integer number (418698).

2^1555151 is an apocalyptic number.

1555151 is a deficient number, since it is larger than the sum of its proper divisors (119641).

1555151 is a wasteful number, since it uses less digits than its factorization.

1555151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119640.

The product of its digits is 625, while the sum is 23.

The square root of 1555151 is about 1247.0569353482. The cubic root of 1555151 is about 115.8575093451.

The spelling of 1555151 in words is "one million, five hundred fifty-five thousand, one hundred fifty-one".