151221611 has 2 divisors, whose sum is σ = 151221612. Its totient is φ = 151221610.

The previous prime is 151221599. The next prime is 151221643. The reversal of 151221611 is 116122151.

151221611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 151221611 - 2⁶ = 151221547 is a prime.

It is not a weakly prime, because it can be changed into another prime (151221671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75610805 + 75610806.

It is an arithmetic number, because the mean of its divisors is an integer number (75610806).

Almost surely, 2^151221611 is an apocalyptic number.

151221611 is a deficient number, since it is larger than the sum of its proper divisors (1).

151221611 is an equidigital number, since it uses as much as digits as its factorization.

151221611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 20.

The square root of 151221611 is about 12297.2196451068. The cubic root of 151221611 is about 532.7677814414.

Adding to 151221611 its reverse (116122151), we get a palindrome (267343762).

The spelling of 151221611 in words is "one hundred fifty-one million, two hundred twenty-one thousand, six hundred eleven".