1201215251 has 2 divisors, whose sum is σ = 1201215252. Its totient is φ = 1201215250.

The previous prime is 1201215179. The next prime is 1201215263. The reversal of 1201215251 is 1525121021.

It is a strong prime.

It is an emirp because it is prime and its reverse (1525121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201215251 - 2¹⁸ = 1200953107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201215551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600607625 + 600607626.

It is an arithmetic number, because the mean of its divisors is an integer number (600607626).

Almost surely, 2^1201215251 is an apocalyptic number.

1201215251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201215251 is an equidigital number, since it uses as much as digits as its factorization.

1201215251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1201215251 is about 34658.5523500333. The cubic root of 1201215251 is about 1063.0171695152.

Adding to 1201215251 its reverse (1525121021), we get a palindrome (2726336272).

The spelling of 1201215251 in words is "one billion, two hundred one million, two hundred fifteen thousand, two hundred fifty-one".