1551455 has 4 divisors (see below), whose sum is σ = 1861752. Its totient is φ = 1241160.

The previous prime is 1551449. The next prime is 1551463. The reversal of 1551455 is 5541551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1551455 - 2¹⁰ = 1550431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155141 + ... + 155150.

It is an arithmetic number, because the mean of its divisors is an integer number (465438).

2^1551455 is an apocalyptic number.

1551455 is a deficient number, since it is larger than the sum of its proper divisors (310297).

1551455 is an equidigital number, since it uses as much as digits as its factorization.

1551455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310296.

The product of its digits is 2500, while the sum is 26.

The square root of 1551455 is about 1245.5741647931. The cubic root of 1551455 is about 115.7656535204.

The spelling of 1551455 in words is "one million, five hundred fifty-one thousand, four hundred fifty-five".