1251555 has 8 divisors (see below), whose sum is σ = 2002512. Its totient is φ = 667488.

The previous prime is 1251533. The next prime is 1251571. The reversal of 1251555 is 5551521.

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

It is not a de Polignac number, because 1251555 - 2⁷ = 1251427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41704 + ... + 41733.

It is an arithmetic number, because the mean of its divisors is an integer number (250314).

2^1251555 is an apocalyptic number.

1251555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1251555 is a deficient number, since it is larger than the sum of its proper divisors (750957).

1251555 is an equidigital number, since it uses as much as digits as its factorization.

1251555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83445.

The product of its digits is 1250, while the sum is 24.

The square root of 1251555 is about 1118.7291897506. The cubic root of 1251555 is about 107.7663846044.

The spelling of 1251555 in words is "one million, two hundred fifty-one thousand, five hundred fifty-five".