151346221 has 4 divisors (see below), whose sum is σ = 162988252. Its totient is φ = 139704192.

The previous prime is 151346219. The next prime is 151346297. The reversal of 151346221 is 122643151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122643151 = 17 ⋅7214303.

It can be written as a sum of positive squares in 2 ways, for example, as 98783721 + 52562500 = 9939^2 + 7250^2 .

It is a cyclic number.

It is not a de Polignac number, because 151346221 - 2¹ = 151346219 is a prime.

It is a super-2 number, since 2×151346221² = 45811357221961682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151346821) 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, 5820996 + ... + 5821021.

It is an arithmetic number, because the mean of its divisors is an integer number (40747063).

Almost surely, 2^151346221 is an apocalyptic number.

It is an amenable number.

151346221 is a deficient number, since it is larger than the sum of its proper divisors (11642031).

151346221 is a wasteful number, since it uses less digits than its factorization.

151346221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11642030.

The product of its digits is 1440, while the sum is 25.

The square root of 151346221 is about 12302.2851942231. The cubic root of 151346221 is about 532.9140787994.

Adding to 151346221 its reverse (122643151), we get a palindrome (273989372).

The spelling of 151346221 in words is "one hundred fifty-one million, three hundred forty-six thousand, two hundred twenty-one".