1211230151 has 4 divisors (see below), whose sum is σ = 1213004232. Its totient is φ = 1209456072.

The previous prime is 1211230123. The next prime is 1211230157. The reversal of 1211230151 is 1510321121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1510321121 = 43 ⋅35123747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211230151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211230157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886016 + ... + 887381.

It is an arithmetic number, because the mean of its divisors is an integer number (303251058).

Almost surely, 2^1211230151 is an apocalyptic number.

1211230151 is a deficient number, since it is larger than the sum of its proper divisors (1774081).

1211230151 is an equidigital number, since it uses as much as digits as its factorization.

1211230151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774080.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1211230151 is about 34802.7319473630. The cubic root of 1211230151 is about 1065.9632306180.

Adding to 1211230151 its reverse (1510321121), we get a palindrome (2721551272).

The spelling of 1211230151 in words is "one billion, two hundred eleven million, two hundred thirty thousand, one hundred fifty-one".