1020155447 has 2 divisors, whose sum is σ = 1020155448. Its totient is φ = 1020155446.

The previous prime is 1020155419. The next prime is 1020155473. The reversal of 1020155447 is 7445510201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020155447 - 2²² = 1015961143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020155047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510077723 + 510077724.

It is an arithmetic number, because the mean of its divisors is an integer number (510077724).

Almost surely, 2^1020155447 is an apocalyptic number.

1020155447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020155447 is an equidigital number, since it uses as much as digits as its factorization.

1020155447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 1020155447 is about 31939.8723698139. The cubic root of 1020155447 is about 1006.6738430673.

Adding to 1020155447 its reverse (7445510201), we get a palindrome (8465665648).

The spelling of 1020155447 in words is "one billion, twenty million, one hundred fifty-five thousand, four hundred forty-seven".