151651621 has 4 divisors (see below), whose sum is σ = 165438144. Its totient is φ = 137865100.

The previous prime is 151651613. The next prime is 151651637. The reversal of 151651621 is 126156151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 151651621 - 2³ = 151651613 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 151651621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151651651) 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, 6893245 + ... + 6893266.

It is an arithmetic number, because the mean of its divisors is an integer number (41359536).

Almost surely, 2^151651621 is an apocalyptic number.

151651621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

151651621 is a deficient number, since it is larger than the sum of its proper divisors (13786523).

151651621 is a wasteful number, since it uses less digits than its factorization.

151651621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13786522.

The product of its digits is 1800, while the sum is 28.

The square root of 151651621 is about 12314.6912669380. The cubic root of 151651621 is about 533.2722919288.

The spelling of 151651621 in words is "one hundred fifty-one million, six hundred fifty-one thousand, six hundred twenty-one".