1201621515449 has 2 divisors, whose sum is σ = 1201621515450. Its totient is φ = 1201621515448.

The previous prime is 1201621515373. The next prime is 1201621515461. The reversal of 1201621515449 is 9445151261021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639788817424 + 561832698025 = 799868^2 + 749555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201621515449 - 2⁴⁰ = 102109887673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1201621515499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600810757724 + 600810757725.

It is an arithmetic number, because the mean of its divisors is an integer number (600810757725).

Almost surely, 2^{1201621515449} is an apocalyptic number.

It is an amenable number.

1201621515449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201621515449 is an equidigital number, since it uses as much as digits as its factorization.

1201621515449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 1201621515449 in words is "one trillion, two hundred one billion, six hundred twenty-one million, five hundred fifteen thousand, four hundred forty-nine".