1551254401 has 4 divisors (see below), whose sum is σ = 1551974404. Its totient is φ = 1550534400.

The previous prime is 1551254371. The next prime is 1551254413. The reversal of 1551254401 is 1044521551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1044521551 = 83 ⋅12584597.

It can be written as a sum of positive squares in 2 ways, for example, as 961930225 + 589324176 = 31015^2 + 24276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551254401 - 2⁷ = 1551254273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1551254401.

It is not an unprimeable number, because it can be changed into a prime (1551254501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356760 + ... + 361081.

It is an arithmetic number, because the mean of its divisors is an integer number (387993601).

Almost surely, 2^1551254401 is an apocalyptic number.

It is an amenable number.

1551254401 is a deficient number, since it is larger than the sum of its proper divisors (720003).

1551254401 is an equidigital number, since it uses as much as digits as its factorization.

1551254401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720002.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 1551254401 is about 39385.9670568084. The cubic root of 1551254401 is about 1157.6066390843.

Adding to 1551254401 its reverse (1044521551), we get a palindrome (2595775952).

The spelling of 1551254401 in words is "one billion, five hundred fifty-one million, two hundred fifty-four thousand, four hundred one".