154070821 has 2 divisors, whose sum is σ = 154070822. Its totient is φ = 154070820.

The previous prime is 154070809. The next prime is 154070831. The reversal of 154070821 is 128070451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114254721 + 39816100 = 10689^2 + 6310^2 .

It is an emirp because it is prime and its reverse (128070451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154070821 - 2⁵ = 154070789 is a prime.

It is a super-2 number, since 2×154070821² = 47475635767228082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 154070821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154070801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77035410 + 77035411.

It is an arithmetic number, because the mean of its divisors is an integer number (77035411).

Almost surely, 2^154070821 is an apocalyptic number.

It is an amenable number.

154070821 is a deficient number, since it is larger than the sum of its proper divisors (1).

154070821 is an equidigital number, since it uses as much as digits as its factorization.

154070821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 154070821 is about 12412.5267774132. The cubic root of 154070821 is about 536.0929947895.

It can be divided in two parts, 1540 and 70821, that added together give a square (72361 = 269²).

The spelling of 154070821 in words is "one hundred fifty-four million, seventy thousand, eight hundred twenty-one".