1551311401 has 2 divisors, whose sum is σ = 1551311402. Its totient is φ = 1551311400.

The previous prime is 1551311357. The next prime is 1551311423. The reversal of 1551311401 is 1041131551.

It is an a-pointer prime, because the next prime (1551311423) can be obtained adding 1551311401 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1393155625 + 158155776 = 37325^2 + 12576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1551311401 - 2⁹ = 1551310889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551311491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775655700 + 775655701.

It is an arithmetic number, because the mean of its divisors is an integer number (775655701).

Almost surely, 2^1551311401 is an apocalyptic number.

It is an amenable number.

1551311401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551311401 is an equidigital number, since it uses as much as digits as its factorization.

1551311401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1551311401 is about 39386.6906581398. The cubic root of 1551311401 is about 1157.6208174529.

Adding to 1551311401 its reverse (1041131551), we get a palindrome (2592442952).

The spelling of 1551311401 in words is "one billion, five hundred fifty-one million, three hundred eleven thousand, four hundred one".