151621 has 8 divisors (see below), whose sum is σ = 161024. Its totient is φ = 142560.

The previous prime is 151609. The next prime is 151631. The reversal of 151621 is 126151.

151621 = T₈₃ + T₈₄ + ... + T₁₁₃.

It is a happy number.

151621 is nontrivially palindromic in base 7.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 151621 - 2¹⁷ = 20549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 151595 and 151604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2041 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (20128).

2¹⁵¹⁶²¹ is an apocalyptic number.

It is an amenable number.

151621 is a deficient number, since it is larger than the sum of its proper divisors (9403).

151621 is an equidigital number, since it uses as much as digits as its factorization.

151621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171.

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

The square root of 151621 is about 389.3854131834. The cubic root of 151621 is about 53.3236397313.

Adding to 151621 its reverse (126151), we get a palindrome (277772).

The spelling of 151621 in words is "one hundred fifty-one thousand, six hundred twenty-one".