1551278 has 4 divisors (see below), whose sum is σ = 2326920. Its totient is φ = 775638.

The previous prime is 1551269. The next prime is 1551289. The reversal of 1551278 is 8721551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8721551 = 19 ⋅459029.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1551278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387818 + ... + 387821.

It is an arithmetic number, because the mean of its divisors is an integer number (581730).

2^1551278 is an apocalyptic number.

1551278 is a deficient number, since it is larger than the sum of its proper divisors (775642).

1551278 is an equidigital number, since it uses as much as digits as its factorization.

1551278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775641.

The product of its digits is 2800, while the sum is 29.

The square root of 1551278 is about 1245.5031111964. The cubic root of 1551278 is about 115.7612509220.

The spelling of 1551278 in words is "one million, five hundred fifty-one thousand, two hundred seventy-eight".