15531401 has 2 divisors, whose sum is σ = 15531402. Its totient is φ = 15531400.

The previous prime is 15531391. The next prime is 15531413. The reversal of 15531401 is 10413551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 313600 = 3901^2 + 560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15531401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15531701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7765700 + 7765701.

It is an arithmetic number, because the mean of its divisors is an integer number (7765701).

Almost surely, 2^15531401 is an apocalyptic number.

It is an amenable number.

15531401 is a deficient number, since it is larger than the sum of its proper divisors (1).

15531401 is an equidigital number, since it uses as much as digits as its factorization.

15531401 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 20.

The square root of 15531401 is about 3940.9898502787. The cubic root of 15531401 is about 249.4998052215.

Adding to 15531401 its reverse (10413551), we get a palindrome (25944952).

The spelling of 15531401 in words is "fifteen million, five hundred thirty-one thousand, four hundred one".