1541220997 has 2 divisors, whose sum is σ = 1541220998. Its totient is φ = 1541220996.

The previous prime is 1541220991. The next prime is 1541221009. The reversal of 1541220997 is 7990221451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1431411556 + 109809441 = 37834^2 + 10479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1541220997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1541220991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770610498 + 770610499.

It is an arithmetic number, because the mean of its divisors is an integer number (770610499).

Almost surely, 2^1541220997 is an apocalyptic number.

It is an amenable number.

1541220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1541220997 is an equidigital number, since it uses as much as digits as its factorization.

1541220997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 1541220997 is about 39258.3876006135. The cubic root of 1541220997 is about 1155.1054661537.

The spelling of 1541220997 in words is "one billion, five hundred forty-one million, two hundred twenty thousand, nine hundred ninety-seven".