145721651 has 8 divisors (see below), whose sum is σ = 151713024. Its totient is φ = 139838400.

The previous prime is 145721647. The next prime is 145721657. The reversal of 145721651 is 156127541.

145721651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 145721651 - 2² = 145721647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145721657) 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, 24275 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (18964128).

Almost surely, 2^145721651 is an apocalyptic number.

145721651 is a deficient number, since it is larger than the sum of its proper divisors (5991373).

145721651 is an equidigital number, since it uses as much as digits as its factorization.

145721651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54061.

The product of its digits is 8400, while the sum is 32.

The square root of 145721651 is about 12071.5223149361. The cubic root of 145721651 is about 526.2288986749.

The spelling of 145721651 in words is "one hundred forty-five million, seven hundred twenty-one thousand, six hundred fifty-one".