15151421 has 2 divisors, whose sum is σ = 15151422. Its totient is φ = 15151420.

The previous prime is 15151393. The next prime is 15151439. The reversal of 15151421 is 12415151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15132100 + 19321 = 3890^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 15151421 - 2²² = 10957117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15151393 and 15151402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15151121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7575710 + 7575711.

It is an arithmetic number, because the mean of its divisors is an integer number (7575711).

Almost surely, 2^15151421 is an apocalyptic number.

It is an amenable number.

15151421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15151421 is an equidigital number, since it uses as much as digits as its factorization.

15151421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 200, while the sum is 20.

The square root of 15151421 is about 3892.4826268077. The cubic root of 15151421 is about 247.4482890300.

Adding to 15151421 its reverse (12415151), we get a palindrome (27566572).

The spelling of 15151421 in words is "fifteen million, one hundred fifty-one thousand, four hundred twenty-one".