1201555097 has 2 divisors, whose sum is σ = 1201555098. Its totient is φ = 1201555096.

The previous prime is 1201555093. The next prime is 1201555123. The reversal of 1201555097 is 7905551021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1133062921 + 68492176 = 33661^2 + 8276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201555097 - 2² = 1201555093 is a prime.

It is a super-2 number, since 2×1201555097² = 2887469302253358818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1201555093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600777548 + 600777549.

It is an arithmetic number, because the mean of its divisors is an integer number (600777549).

Almost surely, 2^1201555097 is an apocalyptic number.

It is an amenable number.

1201555097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201555097 is an equidigital number, since it uses as much as digits as its factorization.

1201555097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 35.

The square root of 1201555097 is about 34663.4547758875. The cubic root of 1201555097 is about 1063.1174091320.

The spelling of 1201555097 in words is "one billion, two hundred one million, five hundred fifty-five thousand, ninety-seven".