1201280621 has 2 divisors, whose sum is σ = 1201280622. Its totient is φ = 1201280620.

The previous prime is 1201280573. The next prime is 1201280629. The reversal of 1201280621 is 1260821021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1163764996 + 37515625 = 34114^2 + 6125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201280621 - 2²⁶ = 1134171757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201280629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600640310 + 600640311.

It is an arithmetic number, because the mean of its divisors is an integer number (600640311).

Almost surely, 2^1201280621 is an apocalyptic number.

It is an amenable number.

1201280621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201280621 is an equidigital number, since it uses as much as digits as its factorization.

1201280621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1201280621 is about 34659.4953944803. The cubic root of 1201280621 is about 1063.0364522574.

The spelling of 1201280621 in words is "one billion, two hundred one million, two hundred eighty thousand, six hundred twenty-one".