1245551 has 2 divisors, whose sum is σ = 1245552. Its totient is φ = 1245550.

The previous prime is 1245529. The next prime is 1245557. The reversal of 1245551 is 1555421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1245551 - 2¹⁸ = 983407 is a prime.

It is a super-3 number, since 3×1245551³ = 5797033351326057453, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622775 + 622776.

It is an arithmetic number, because the mean of its divisors is an integer number (622776).

2^1245551 is an apocalyptic number.

1245551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245551 is an equidigital number, since it uses as much as digits as its factorization.

1245551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 23.

The square root of 1245551 is about 1116.0425619124. The cubic root of 1245551 is about 107.5937815121.

The spelling of 1245551 in words is "one million, two hundred forty-five thousand, five hundred fifty-one".