1251553 has 8 divisors (see below), whose sum is σ = 1310400. Its totient is φ = 1193808.

The previous prime is 1251533. The next prime is 1251571. The reversal of 1251553 is 3551521.

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 1251553 - 2¹⁷ = 1120481 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251533) 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, 2778 + ... + 3196.

It is an arithmetic number, because the mean of its divisors is an integer number (163800).

2^1251553 is an apocalyptic number.

It is an amenable number.

1251553 is a deficient number, since it is larger than the sum of its proper divisors (58847).

1251553 is a wasteful number, since it uses less digits than its factorization.

1251553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its digits is 750, while the sum is 22.

The square root of 1251553 is about 1118.7282958789. The cubic root of 1251553 is about 107.7663272003.

Subtracting 1251553 from its reverse (3551521), we obtain a cube (2299968 = 132³).

The spelling of 1251553 in words is "one million, two hundred fifty-one thousand, five hundred fifty-three".