1541091421 has 2 divisors, whose sum is σ = 1541091422. Its totient is φ = 1541091420.

The previous prime is 1541091397. The next prime is 1541091443. The reversal of 1541091421 is 1241901451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 890127225 + 650964196 = 29835^2 + 25514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1541091421 - 2⁹ = 1541090909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1541091421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1541091451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770545710 + 770545711.

It is an arithmetic number, because the mean of its divisors is an integer number (770545711).

Almost surely, 2^1541091421 is an apocalyptic number.

It is an amenable number.

1541091421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1541091421 is an equidigital number, since it uses as much as digits as its factorization.

1541091421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1541091421 is about 39256.7372689071. The cubic root of 1541091421 is about 1155.0730939543.

Adding to 1541091421 its reverse (1241901451), we get a palindrome (2782992872).

The spelling of 1541091421 in words is "one billion, five hundred forty-one million, ninety-one thousand, four hundred twenty-one".