151310221 has 4 divisors (see below), whose sum is σ = 152808444. Its totient is φ = 149812000.

The previous prime is 151310209. The next prime is 151310231. The reversal of 151310221 is 122013151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100701225 + 50608996 = 10035^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 151310221 - 2⁵ = 151310189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 151310195 and 151310204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151310231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748960 + ... + 749161.

It is an arithmetic number, because the mean of its divisors is an integer number (38202111).

Almost surely, 2^151310221 is an apocalyptic number.

It is an amenable number.

151310221 is a deficient number, since it is larger than the sum of its proper divisors (1498223).

151310221 is a wasteful number, since it uses less digits than its factorization.

151310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498222.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 151310221 is about 12300.8219644055. The cubic root of 151310221 is about 532.8718215430.

Adding to 151310221 its reverse (122013151), we get a palindrome (273323372).

It can be divided in two parts, 15 and 1310221, that multiplied together give a triangular number (19653315 = T₆₂₆₉).

The spelling of 151310221 in words is "one hundred fifty-one million, three hundred ten thousand, two hundred twenty-one".