1551979 has 8 divisors (see below), whose sum is σ = 1823472. Its totient is φ = 1302240.

The previous prime is 1551967. The next prime is 1551997. The reversal of 1551979 is 9791551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1551979 - 2⁹ = 1551467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5284 + ... + 5569.

It is an arithmetic number, because the mean of its divisors is an integer number (227934).

2^1551979 is an apocalyptic number.

1551979 is a deficient number, since it is larger than the sum of its proper divisors (271493).

1551979 is a wasteful number, since it uses less digits than its factorization.

1551979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10877.

The product of its digits is 14175, while the sum is 37.

The square root of 1551979 is about 1245.7844917962. The cubic root of 1551979 is about 115.7786852389.

The spelling of 1551979 in words is "one million, five hundred fifty-one thousand, nine hundred seventy-nine".