1551115 has 4 divisors (see below), whose sum is σ = 1861344. Its totient is φ = 1240888.

The previous prime is 1551113. The next prime is 1551133. The reversal of 1551115 is 5111551.

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: 5111551 = 19 ⋅269029.

It is a cyclic number.

It is not a de Polignac number, because 1551115 - 2¹ = 1551113 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

1551115 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1551092 and 1551101.

It is not an unprimeable number, because it can be changed into a prime (1551113) 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, 155107 + ... + 155116.

It is an arithmetic number, because the mean of its divisors is an integer number (465336).

2^1551115 is an apocalyptic number.

1551115 is a deficient number, since it is larger than the sum of its proper divisors (310229).

1551115 is an equidigital number, since it uses as much as digits as its factorization.

1551115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310228.

The product of its digits is 125, while the sum is 19.

The square root of 1551115 is about 1245.4376740729. The cubic root of 1551115 is about 115.7571962555.

Adding to 1551115 its reverse (5111551), we get a palindrome (6662666).

The spelling of 1551115 in words is "one million, five hundred fifty-one thousand, one hundred fifteen".