1151220427 has 8 divisors (see below), whose sum is σ = 1347770592. Its totient is φ = 962692800.

The previous prime is 1151220419. The next prime is 1151220437. The reversal of 1151220427 is 7240221511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1151220427 - 2³ = 1151220419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1151220437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005324 + ... + 2005897.

It is an arithmetic number, because the mean of its divisors is an integer number (168471324).

Almost surely, 2^1151220427 is an apocalyptic number.

1151220427 is a deficient number, since it is larger than the sum of its proper divisors (196550165).

1151220427 is an equidigital number, since it uses as much as digits as its factorization.

1151220427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011269.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1151220427 is about 33929.6393585314. The cubic root of 1151220427 is about 1048.0600391351.

Adding to 1151220427 its reverse (7240221511), we get a palindrome (8391441938).

The spelling of 1151220427 in words is "one billion, one hundred fifty-one million, two hundred twenty thousand, four hundred twenty-seven".