1020154235449 has 2 divisors, whose sum is σ = 1020154235450. Its totient is φ = 1020154235448.

The previous prime is 1020154235447. The next prime is 1020154235489. The reversal of 1020154235449 is 9445324510201.

It is an a-pointer prime, because the next prime (1020154235489) can be obtained adding 1020154235449 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929488810000 + 90665425449 = 964100^2 + 301107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020154235449 - 2¹ = 1020154235447 is a prime.

Together with 1020154235447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1020154235447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510077117724 + 510077117725.

It is an arithmetic number, because the mean of its divisors is an integer number (510077117725).

Almost surely, 2^{1020154235449} is an apocalyptic number.

It is an amenable number.

1020154235449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020154235449 is an equidigital number, since it uses as much as digits as its factorization.

1020154235449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 1020154235449 in words is "one trillion, twenty billion, one hundred fifty-four million, two hundred thirty-five thousand, four hundred forty-nine".