15501401 has 2 divisors, whose sum is σ = 15501402. Its totient is φ = 15501400.

The previous prime is 15501389. The next prime is 15501407. The reversal of 15501401 is 10410551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14258176 + 1243225 = 3776^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 15501401 - 2⁶ = 15501337 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15501401.

It is not a weakly prime, because it can be changed into another prime (15501407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750700 + 7750701.

It is an arithmetic number, because the mean of its divisors is an integer number (7750701).

Almost surely, 2^15501401 is an apocalyptic number.

It is an amenable number.

15501401 is a deficient number, since it is larger than the sum of its proper divisors (1).

15501401 is an equidigital number, since it uses as much as digits as its factorization.

15501401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 15501401 is about 3937.1818601634. The cubic root of 15501401 is about 249.3390595039.

Adding to 15501401 its reverse (10410551), we get a palindrome (25911952).

The spelling of 15501401 in words is "fifteen million, five hundred one thousand, four hundred one".