1551667 has 4 divisors (see below), whose sum is σ = 1671040. Its totient is φ = 1432296.

The previous prime is 1551661. The next prime is 1551677. The reversal of 1551667 is 7661551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7661551 = 1783 ⋅4297.

It is a cyclic number.

It is not a de Polignac number, because 1551667 - 2³ = 1551659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59667 + ... + 59692.

It is an arithmetic number, because the mean of its divisors is an integer number (417760).

2^1551667 is an apocalyptic number.

1551667 is a deficient number, since it is larger than the sum of its proper divisors (119373).

1551667 is a wasteful number, since it uses less digits than its factorization.

1551667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119372.

The product of its digits is 6300, while the sum is 31.

The square root of 1551667 is about 1245.6592632016. The cubic root of 1551667 is about 115.7709262484.

The spelling of 1551667 in words is "one million, five hundred fifty-one thousand, six hundred sixty-seven".