1201156542 has 48 divisors (see below), whose sum is σ = 2647513440. Its totient is φ = 393520896.

The previous prime is 1201156519. The next prime is 1201156553. The reversal of 1201156542 is 2456511021.

1201156542 is a `hidden beast` number, since 1 + 2 + 0 + 1 + 1 + 5 + 654 + 2 = 666.

1201156542 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251634 + ... + 256362.

It is an arithmetic number, because the mean of its divisors is an integer number (55156530).

Almost surely, 2^1201156542 is an apocalyptic number.

1201156542 is an abundant number, since it is smaller than the sum of its proper divisors (1446356898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1201156542 is a wasteful number, since it uses less digits than its factorization.

1201156542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4977 (or 4974 counting only the distinct ones).

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

The square root of 1201156542 is about 34657.7053770154. The cubic root of 1201156542 is about 1062.9998510283. Note that the first 3 decimals are identical.

Adding to 1201156542 its reverse (2456511021), we get a palindrome (3657667563).

The spelling of 1201156542 in words is "one billion, two hundred one million, one hundred fifty-six thousand, five hundred forty-two".