1242155061 has 32 divisors (see below), whose sum is σ = 2152043520. Its totient is φ = 693291312.

The previous prime is 1242155053. The next prime is 1242155071. The reversal of 1242155061 is 1605512421.

1242155061 is a `hidden beast` number, since 12 + 42 + 1 + 550 + 61 = 666.

It is not a de Polignac number, because 1242155061 - 2³ = 1242155053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242155021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68295 + ... + 84548.

It is an arithmetic number, because the mean of its divisors is an integer number (67251360).

Almost surely, 2^1242155061 is an apocalyptic number.

It is an amenable number.

1242155061 is a deficient number, since it is larger than the sum of its proper divisors (909888459).

1242155061 is a wasteful number, since it uses less digits than its factorization.

1242155061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152902 (or 152896 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1242155061 is about 35244.2202495672. The cubic root of 1242155061 is about 1074.9590930170.

Adding to 1242155061 its reverse (1605512421), we get a palindrome (2847667482).

The spelling of 1242155061 in words is "one billion, two hundred forty-two million, one hundred fifty-five thousand, sixty-one".