1201240251 has 12 divisors (see below), whose sum is σ = 1810565328. Its totient is φ = 766008144.

The previous prime is 1201240237. The next prime is 1201240259. The reversal of 1201240251 is 1520421021.

It is not a de Polignac number, because 1201240251 - 2¹⁷ = 1201109179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201240259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2901340 + ... + 2901753.

It is an arithmetic number, because the mean of its divisors is an integer number (150880444).

Almost surely, 2^1201240251 is an apocalyptic number.

1201240251 is a deficient number, since it is larger than the sum of its proper divisors (609325077).

1201240251 is a wasteful number, since it uses less digits than its factorization.

1201240251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5803122 (or 5803119 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1201240251 is about 34658.9130094987. The cubic root of 1201240251 is about 1063.0245440594.

Adding to 1201240251 its reverse (1520421021), we get a palindrome (2721661272).

The spelling of 1201240251 in words is "one billion, two hundred one million, two hundred forty thousand, two hundred fifty-one".