1211531151 has 8 divisors (see below), whose sum is σ = 1615541760. Its totient is φ = 807603992.

The previous prime is 1211531131. The next prime is 1211531159. The reversal of 1211531151 is 1511351121.

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 1211531151 - 2¹³ = 1211522959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211531159) 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, 32560 + ... + 59018.

It is an arithmetic number, because the mean of its divisors is an integer number (201942720).

Almost surely, 2^1211531151 is an apocalyptic number.

1211531151 is a deficient number, since it is larger than the sum of its proper divisors (404010609).

1211531151 is a wasteful number, since it uses less digits than its factorization.

1211531151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41725.

The product of its digits is 150, while the sum is 21.

The square root of 1211531151 is about 34807.0560518984. The cubic root of 1211531151 is about 1066.0515233226.

Adding to 1211531151 its reverse (1511351121), we get a palindrome (2722882272).

The spelling of 1211531151 in words is "one billion, two hundred eleven million, five hundred thirty-one thousand, one hundred fifty-one".