1128154421 has 2 divisors, whose sum is σ = 1128154422. Its totient is φ = 1128154420.

The previous prime is 1128154411. The next prime is 1128154463. The reversal of 1128154421 is 1244518211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1083331396 + 44823025 = 32914^2 + 6695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128154421 - 2¹⁸ = 1127892277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128154411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564077210 + 564077211.

It is an arithmetic number, because the mean of its divisors is an integer number (564077211).

Almost surely, 2^1128154421 is an apocalyptic number.

It is an amenable number.

1128154421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128154421 is an equidigital number, since it uses as much as digits as its factorization.

1128154421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 29.

The square root of 1128154421 is about 33588.0100780025. The cubic root of 1128154421 is about 1041.0130725636.

The spelling of 1128154421 in words is "one billion, one hundred twenty-eight million, one hundred fifty-four thousand, four hundred twenty-one".