151421605 has 4 divisors (see below), whose sum is σ = 181705932. Its totient is φ = 121137280.

The previous prime is 151421603. The next prime is 151421609. The reversal of 151421605 is 506124151.

It is a happy number.

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 105534529 + 45887076 = 10273^2 + 6774^2 .

It is not a de Polignac number, because 151421605 - 2¹ = 151421603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 151421605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151421603) 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, 15142156 + ... + 15142165.

It is an arithmetic number, because the mean of its divisors is an integer number (45426483).

Almost surely, 2^151421605 is an apocalyptic number.

It is an amenable number.

151421605 is a deficient number, since it is larger than the sum of its proper divisors (30284327).

151421605 is an equidigital number, since it uses as much as digits as its factorization.

151421605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30284326.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 151421605 is about 12305.3486338259. The cubic root of 151421605 is about 533.0025437916.

Adding to 151421605 its reverse (506124151), we get a palindrome (657545756).

The spelling of 151421605 in words is "one hundred fifty-one million, four hundred twenty-one thousand, six hundred five".