1551139 has 4 divisors (see below), whose sum is σ = 1587256. Its totient is φ = 1515024.

The previous prime is 1551133. The next prime is 1551157. The reversal of 1551139 is 9311551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9311551 = 41 ⋅227111.

It is a cyclic number.

It is not a de Polignac number, because 1551139 - 2⁵ = 1551107 is a prime.

It is a Duffinian number.

1551139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1551133) 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, 17994 + ... + 18079.

It is an arithmetic number, because the mean of its divisors is an integer number (396814).

2^1551139 is an apocalyptic number.

1551139 is a deficient number, since it is larger than the sum of its proper divisors (36117).

1551139 is an equidigital number, since it uses as much as digits as its factorization.

1551139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36116.

The product of its digits is 675, while the sum is 25.

The square root of 1551139 is about 1245.4473092026. The cubic root of 1551139 is about 115.7577932794.

The spelling of 1551139 in words is "one million, five hundred fifty-one thousand, one hundred thirty-nine".