154253021 has 4 divisors (see below), whose sum is σ = 166118652. Its totient is φ = 142387392.

The previous prime is 154253003. The next prime is 154253063. The reversal of 154253021 is 120352451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62188996 + 92064025 = 7886^2 + 9595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154253021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154253921) 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, 5932796 + ... + 5932821.

It is an arithmetic number, because the mean of its divisors is an integer number (41529663).

Almost surely, 2^154253021 is an apocalyptic number.

It is an amenable number.

154253021 is a deficient number, since it is larger than the sum of its proper divisors (11865631).

154253021 is a wasteful number, since it uses less digits than its factorization.

154253021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11865630.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 154253021 is about 12419.8639686592. The cubic root of 154253021 is about 536.3042345844.

The spelling of 154253021 in words is "one hundred fifty-four million, two hundred fifty-three thousand, twenty-one".