1020397145 has 4 divisors (see below), whose sum is σ = 1224476580. Its totient is φ = 816317712.

The previous prime is 1020397123. The next prime is 1020397163. The reversal of 1020397145 is 5417930201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5417930201 = 479 ⋅11310919.

It can be written as a sum of positive squares in 2 ways, for example, as 275161744 + 745235401 = 16588^2 + 27299^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020397145 - 2¹⁴ = 1020380761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102039710 + ... + 102039719.

It is an arithmetic number, because the mean of its divisors is an integer number (306119145).

Almost surely, 2^1020397145 is an apocalyptic number.

It is an amenable number.

1020397145 is a deficient number, since it is larger than the sum of its proper divisors (204079435).

1020397145 is an equidigital number, since it uses as much as digits as its factorization.

1020397145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204079434.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 1020397145 is about 31943.6557863999. The cubic root of 1020397145 is about 1006.7533380902.

The spelling of 1020397145 in words is "one billion, twenty million, three hundred ninety-seven thousand, one hundred forty-five".