151723121 has 4 divisors (see below), whose sum is σ = 165516144. Its totient is φ = 137930100.

The previous prime is 151723067. The next prime is 151723123. The reversal of 151723121 is 121327151.

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 not a de Polignac number, because 151723121 - 2⁶ = 151723057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151723123) 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, 6896495 + ... + 6896516.

It is an arithmetic number, because the mean of its divisors is an integer number (41379036).

Almost surely, 2^151723121 is an apocalyptic number.

151723121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

151723121 is a deficient number, since it is larger than the sum of its proper divisors (13793023).

151723121 is a wasteful number, since it uses less digits than its factorization.

151723121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13793022.

The product of its digits is 420, while the sum is 23.

The square root of 151723121 is about 12317.5939614845. The cubic root of 151723121 is about 533.3560870067.

The spelling of 151723121 in words is "one hundred fifty-one million, seven hundred twenty-three thousand, one hundred twenty-one".