1242011251 has 12 divisors (see below), whose sum is σ = 1347865272. Its totient is φ = 1143944256.

The previous prime is 1242011233. The next prime is 1242011261. The reversal of 1242011251 is 1521102421.

It is a de Polignac number, because none of the positive numbers 2^k-1242011251 is a prime.

It is a super-2 number, since 2×1242011251² = 3085183895221170002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1242011261) 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, 71055 + ... + 86791.

It is an arithmetic number, because the mean of its divisors is an integer number (112322106).

Almost surely, 2^1242011251 is an apocalyptic number.

1242011251 is a deficient number, since it is larger than the sum of its proper divisors (105854021).

1242011251 is a wasteful number, since it uses less digits than its factorization.

1242011251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16230 (or 16217 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1242011251 is about 35242.1799978378. The cubic root of 1242011251 is about 1074.9176070978.

Adding to 1242011251 its reverse (1521102421), we get a palindrome (2763113672).

The spelling of 1242011251 in words is "one billion, two hundred forty-two million, eleven thousand, two hundred fifty-one".