154100721 has 8 divisors (see below), whose sum is σ = 212095744. Its totient is φ = 99419760.

The previous prime is 154100719. The next prime is 154100761. The reversal of 154100721 is 127001451.

It is a happy number.

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

It is not a de Polignac number, because 154100721 - 2¹ = 154100719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154100761) 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, 828406 + ... + 828591.

It is an arithmetic number, because the mean of its divisors is an integer number (26511968).

Almost surely, 2^154100721 is an apocalyptic number.

It is an amenable number.

154100721 is a deficient number, since it is larger than the sum of its proper divisors (57995023).

154100721 is a wasteful number, since it uses less digits than its factorization.

154100721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657031.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 154100721 is about 12413.7311474029. The cubic root of 154100721 is about 536.1276717942.

The spelling of 154100721 in words is "one hundred fifty-four million, one hundred thousand, seven hundred twenty-one".